Thursday, 11 February 2021

The white-throated magpie-jay

 

One of the largest and most conspicuous songbirds in Guanacaste is the White-throated Magpie-Jay (Calocitta formosa). This social and vocal bird is normally seen in family groups of five to ten birds and is quite attractive. The blue body, white breast, exceptionally long blue tail, and tall, forward-curving topknot feathers on its head make it unmistakable. The large Central American species of magpie-jay range in the Pacific-slope thorn forest from Jalisco, Costa Rica, and Mexico to Guanacaste. It is common in thorn forests, deciduous woodland, gallery forest, forest edges, and cultivated areas like coffee plants.
Also, a closely related species, the Black-throated Magpie-Jay, is found in Mexico. The White-throated Magpie-Jay is found in savannas, dry forests, gallery forests, farmsteads, ranches, backyards, and woodlots. Roaming in family groups, these intelligent and omnivorous jays search for small lizards, caterpillars, frogs, beetles, grasshoppers, katydids, and cockroaches. Other foods include fruits, corn, eggs, and nestlings of other birds, fruits, grains, seeds, the young of other birds, and the nectar of balsa (Ochroma) flowers. At La Ensenada Lodge, they boldly enter the open-air restaurant to pick up fallen food scraps. The nesting season occurs from February through July.
While incubating, the female is visited by several family members and the male, who all take turns feeding her. The young are fed by the parents and by the young from previous broods. This magpie is omnivorous, consuming an extensive range of animal and plant matter. The juvenile birds take several years to acquire the full range of foraging skills of their parents. White-throated Magpie-Jay does not take on any migratory movements, though males disperse away from their natal territories a few years after fledging, and it is not considered threatened by human activities.
The White-throated Magpie-Jay can be found in Guanacaste's NPS-Guanacaste, Palo Verde, Santa Rosa, and Las Baulas-and in the Lomas Barbuda! BR. It can also be seen at Sugar Beach, Tamarindo, Hacienda Solimar, La Ensenada Lodge, Playa Dofia Ana, La Pacifica, east to Hotel Borinquen Mountain Resort, and southeast to Tarcol Lodge at the mouth of the Rio Tarcoles. The white-throated magpie is a very noisy, gregarious bird, mostly likes to travel with flocks, mobbing its observers. Source CP
Facts:
Calocitta Formosa
Costa Rican names: Urraca copetona; urraca; piapia azul.
Status: Permanent resident.
length: 18 to 22 inches. (43 to 56cm)
Weight: 7.2 ounces (205 to 210 grams).
Range: Central Mexico to Costa Rica.
Elevational range: Sea level to 4,000 feet

 







Wednesday, 10 February 2021

The Cloud Cisticola or tink-tink cisticola

 

The Cloud Cisticola or tink-tink cisticola is near-endemic to southern Africa and occurs in South Africa, Angola, Mozambique, Lesotho, and sparsely in Swaziland. However, a widely separated relict population occurs in Zambia and southern Zaire. It occurs in the western and southern Cape Province and from 22°E through the Eastern Cape Province and Transkei (where it is sparse), to the Free State, Transvaal, Lesotho lowlands, and inland KwaZulu-Natal.
Cloud Cisticola is most abundant in the southern Transvaal and the southern and eastern Free State. There is a remarkable cut-off west of25° E. It is included in southeastern Botswana in its range, but it was not recorded there during the atlas period, nor does there seem to be any other confirmed record from that country. Easily confused with four other small grass cisticola species, it is identified mainly on the basis of its call, except for the isolated nominate race in the Western Cape Province, which can be identified by its ventral streaking.
This race is sometimes considered to be a separate species. The atlas records primarily reflect the summer distribution and the map is probably fairly accurate, although some misidentifications are inevitable in this group.
Habitat:
It occurs in short grasslands with relatively low basal cover, mainly in the grassland biome and in the Grassy Karoo; it is absent above 2000 m. It requires open grassland and does not tolerate invasion by scrub and trees. In the Western Cape Province it has colonized and breeds in fields of winter cereal crops. It was reported from estuarine marshland near Port Elizabeth. It is common in Themeda triandra grassland on the Highveld where it over-laps mainly with Ayres’ Cisticola C. ayresii.
Movements:
There is strong seasonality in reporting rates with a drop in winter when the species behaves unobtrusively and is difficult to identify without the help of diagnostic calls and displays. Records from the Western Cape Province show no seasonality, presumably because this population can be identified year-round on plumage. Droughts, overgrazing, and burning affect its habitat and must prompt local movements. There is apparently no record of regular seasonal movements in the literature.
Breeding:
Atlas records confirm that breeding occurs earlier (July–December) in the nominate race in the Western Cape Province than elsewhere, where egg-laying spans late spring and summer (September–March)
Inter specific relationships:
It is most closely related to Ayres’ and Pale crowned C. brunnescens Cisticolas. It overlaps extensively with all four similar small cisticolas. It is a host of the brood-parasitic Cuckoo Finch Anomalospiza imberbis.
Historical distribution and conservation:
It has almost disappeared from the Cape Flats where it was displaced by alien vegetation and development for agriculture and housing. It is suggested that it is more widely distributed in KwaZulu-Natal than recorded in this atlas, but there was some confusion between this species and Ayres’ Cisticola in Cyrus & Robson. It expanded its Transvaal range westwards during the years of good rain in the 1970s.The Cloud Cisticola is not threatened. The ability of the western race to adapt to agriculture means that it was not displaced on a large scale by the loss of indigenous fynbos. Source - CP




Tuesday, 19 January 2021

What Makes Owls So Wonderful

 

As creatures of the night, owls can seem mysterious and kind of spooky. Some people think of them as bad omens harbingers of death, but they can also be symbols of knowledge and wisdom. Also, fascinating people for millennia. Everyone knows what an owl is, even if you haven't seen one in real life. They're instantly recognizable with their large Roundheads, flat faces, and forward staring eyes.
We seem to be drawn to them because they look like people. They're birds, but they also kind of look like us. That was our birds. And they do the same kinds of things that all birds do, find food, bring their feathers, defend their territory, lay eggs, and raise young. But unlike most other birds, owls do these things in the dark. In this article, we'll investigate just what makes an owl an owl.
Look at the diversity of animals throughout the world. We'll explore owl superpowers that let them Own the Night all around the globe will examine the day-to-day life or night to the nightlife ours looking at courting and breeding habits. How a baby owl goes from a downy fluffball to an adult capable of hunting for itself.
To listen in to the various hoots toots and screeches they make and talk about just what they're trying to say. We'll investigate the way that people have thought about and interacted with our students for centuries. And look at how owls are doing today. We'll talk about how to find out what you can do to make a friendlier environment for hours near you. owls are just plain fascinating creatures. I hope you'll join me in exploring the wonderful world.

Sunday, 27 December 2020

The Cloud Cisticola or tink-tink cisticola

 

The Cloud Cisticola or tink-tink cisticola is near-endemic to southern Africa and occurs in South Africa, Angola, Mozambique, Lesotho, and sparsely in Swaziland. However, a widely separated relict population occurs in Zambia and southern Zaire. It occurs in the western and southern Cape Province and from 22°E through the Eastern Cape Province and Transkei (where it is sparse), to the Free State, Transvaal, Lesotho lowlands, and inland KwaZulu-Natal.
Cloud Cisticola is most abundant in the southern Transvaal and the southern and eastern Free State. There is a remarkable cut-off west of25° E. It is included in southeastern Botswana in its range, but it was not recorded there during the atlas period, nor does there seem to be any other confirmed record from that country. Easily confused with four other small grass cisticola species, it is identified mainly on the basis of its call, except for the isolated nominate race in the Western Cape Province, which can be identified by its ventral streaking.
This race is sometimes considered to be a separate species. The atlas records primarily reflect the summer distribution and the map is probably fairly accurate, although some misidentifications are inevitable in this group.

Habitat:

It occurs in short grasslands with relatively low basal cover, mainly in the grassland biome and in the Grassy Karoo; it is absent above 2000 m. It requires open grassland and does not tolerate invasion by scrub and trees. In the Western Cape Province it has colonized and breeds in fields of winter cereal crops. It was reported from estuarine marshland near Port Elizabeth. It is common in Themeda triandra grassland on the Highveld where it over-laps mainly with Ayres’ Cisticola C. ayresii.

Movements:

There is strong seasonality in reporting rates with a drop in winter when the species behaves unobtrusively and is difficult to identify without the help of diagnostic calls and displays. Records from the Western Cape Province show no seasonality, presumably because this population can be identified year-round on plumage. Droughts, overgrazing, and burning affect its habitat and must prompt local movements. There is apparently no record of regular seasonal movements in the literature.

Breeding:

Atlas records confirm that breeding occurs earlier (July–December) in the nominate race in the Western Cape Province than elsewhere, where egg-laying spans late spring and summer (September–March)

Interspecific relationships:

It is most closely related to Ayres’ and Pale crowned C. brunnescens Cisticolas. It overlaps extensively with all four similar small cisticolas. It is a host of the brood-parasitic Cuckoo Finch Anomalospiza imberbis.

Historical distribution and conservation:

It has almost disappeared from the Cape Flats where it was displaced by alien vegetation and development for agriculture and housing. It is suggested that it is more widely distributed in KwaZulu-Natal than recorded in this atlas, but there was some confusion between this species and Ayres’ Cisticola in Cyrus & Robson. It expanded its Transvaal range westwards during the years of good rain in the 1970s. The Cloud Cisticola is not threatened. The ability of the western race to adapt to agriculture means that it was not displaced on a large scale by the loss of indigenous fynbos.

Monday, 21 September 2020

The white-browed robin-chat,

Heuglin’s Robin is the most wide-ranging Cossypha robin in the Afro tropical region but has only a limited distribution in the more tropical parts of southern Africa. The range extends from northern KwaZulu-Natal through Swaziland, the Transvaal Lowveld, and the Limpopo Valley, over most of Zimbabwe, and westward into the Okavango and Caprivi regions. Heuglin’s Robin is also known as white-browed robin-chat, (Cossypha heuglini) it is a species of bird in the family Muscicapidae.

It is recognized two subspecies in southern Africa: C.h. orphea with a stronghold in the Okavango and adjacent tributaries to the Zambezi River, and euro note east of this throughout the remainder of the region. Its magnificent crescendo duetting song is one of the characteristic sounds of Africa in both towns and wildlife sanctuaries.

Its white eyebrow and overall bright orange under-parts provide a unique combination that should preclude confusion with any other southern African bird, yet for many years other species have repeatedly been misidentified as Heuglin’s Robin in areas which are ecologically unsuitable and outside its range.

Habitat:

Throughout its range, it is a characteristic species of riverine forest, even where this is limited to a thin discontinuous fringe. Where it is common it also frequents evergreen thickets (as on termite mounds) in woodland and in modified areas, frequenting the gardens of homesteads and towns.

In the Transvaal and Zimbabwe, it was found most commonly (up to 3 birds/ha) in the riverine forest with a high percentage of evergreens, discontinuous canopy and well-developed shrub and ground layers. The vegetation analysis besides showing where it is most commonly encountered provides a diagrammatic representation of its decreasing abundance and smaller range from Zimbabwe southwards. From Zimbabwe northwards it is a common garden bird and may nest close to human dwellings in places such as vine-covered verandah trellises.

Movements:

It is not known to undertake regular seasonal movements anywhere within its range. The slightly lower reporting rates in winter in some regions are probably explained by quieter and more covert behavior in the nonbreeding season.

Breeding:

The bird records are showing that its breeding starts in July–May in the north and September–April further south (Zone6) with a general peak in October–November.

Eggs

Eggs are laying in usually restricted to September–January. But on a few observations have been recorded in August from Zimbabwe notwithstanding. 

Interspecific Relationships

From the eastern high lands of Zimbabwe south into the Transvaal and KwaZulu-Natal (and in many other parts of its Afrotropical range), it shares its habitat with the Natal Robin C. natalensis (Farkas1969). These species breed alongside each other and have similar diets but there is as yet no evidence of so-called competitive exclusion of either species by the other.

Historical Distribution and Conservation:

It appears to be slowly extending its established range in the south. In the 1950s its southernmost limit was that portion of the Mkuze River east of the Lebombo range (the ‘northern Zululand’ of McLachlan & Liversidge 1957). By 1970 the birds sit had reached the Hluhluwe River in the south and pushed west of the Lebombo range by way of the Pongolo and Mkuze rivers into the Louwsburg and Magut districts of KwaZulu-Natal.

However, severe damage done to the riverine forests of northern KwaZulu-Natal by Cyclone Demoina in 1987, when it has probably halted or at least set back this expansionary phase. Heuglin’s Robin is common throughout most of its widespread Afro tropical range and is not listed The IUCN classifies it as a least-concern species.

Diet

Heuglin’s Robin diet consists of many different things, like beetles, ants, termites, and some other insects, arthropods, frogs, and variable fruits. The robin likes to bathes in water.

Vocalizations

The Heuglin’s Robin contact calls include repeated pit-porlee, chiiritter-porlii and da-da-da-teee and end with da-teeee or chickle-ter-tweep. Therefore, the alarm call is takaata-kaata-kaata. The white-browed robin-chat has a melodious song, usually given at dawn and dusk, is quiet at first, and then becomes louder. It consists of many pip-pip-ureee, when singing loudly, its beak is wide open and its breast is inflated. The bird tail moves when each note is sung. Also, some observations have seen when pairs may duet.



Tuesday, 1 September 2020

Starling Birds – Saints or Sinners?

Starling birds are so familiar that birdwatchers all too often ignore it. Yet, if it were as rare today as it used to be its superb iridescent plumage would rank it as one of the most beautiful of British Birds. The starling is one of our most common birds. More than six million pairs breed every year.

In the winter they are joined by at least 30 million more individuals that migrate here from northern and eastern Europe. Yet, up until the middle of the last century, the starling was relatively uncommon in Britain. The rise in the British population is part of a general pattern throughout Europe in which starlings have increased in numbers and spread westwards.

Omnivorous eaters

The reasons for this population increase is not completely understood but an important factor is the bird's ability to live on a wide variety of foods. Fruits, seeds, flying insects, caterpillars, grubs, earthworms and household waste are all eaten, although the amounts taken of these different foods vary with the season.

In spring the starling's diet consists mainly of insects and their larvae; in summer fruits become important; by winter these are replaced with seeds. Throughout the year, however, animal foods remain an important source of protein. Another reason for the starling's success is that, during the last century or so, large areas of Europe's indigenous forests have been cleared to create grassland for farming.

Habitats

Close cropped grassland is the starling's favorite habitat. One can often see those probing grassroots for invertebrates such as caterpillars, earthworms, and leatherjackets (the larvae of crane flies and a serious agricultural. During the breeding season, starlings spend most of their feeding time in grassland.

However, at other times of the year, they spread out into new habitats a necessity if they are to take full advantage of their omnivorous nature. Bushes, hedgerows, and trees are visited by starlings for fruits such as cherries, elderberries and sloes. Moreover, they also search stubble fields, newly sown cereal fields and farmyards for seeds.

Forming flocks

People often ask how starlings gather so quickly and in such numbers when food is put out into a garden. Starlings have an excellent memory, especially when it comes to remembering places where food appears regularly and in abundance. These places are always under observation by at least one bird. When food appears, one starling flies down to investigate.

If it begins to peck, then all the other starlings nearby recognize this as a sign of food and fly down to join in. Within a very short time, a feeding flock has formed. The formation of a flock for feeding is advantageous for the flock members in that they can feed much faster than when they are on their own.

There are many more eyes on the look-out for predators such as cats and sparrow hawks. Against this, however, is the problem that a flock can grow too big for the food source, with the result that bickering and fighting ensue. The starlings' An omnivorous diet means that.

Depending on what they are eating, a large flock can either inflict great damage or be of great benefit. The starlings' consumption of large numbers of leatherjackets is an obvious boon to the farmer but, on the other hand, they can devastate cherry orchards that are in fruit.

Roosting by the million

As well as feeding in flocks, starlings also roost in flocks. Some times more than a million birds gather together in night roosts, attracting large numbers of predators. In places such as Trafalgar Square, huge flocks can be seen wheeling around and darkening the sky at dusk.

Quite why starlings roost in such numbers is not yet known, but the advantages must be considerable since they outweigh the attentions of predators. It may be that roosting presents a good opportunity for poorly fed birds to learn from their better-fed neighbors the location of good food supplies.

Nesting in letterboxes

The starling's choice of nesting site shows again how well it takes advantage of opportunities presented by a man. Its most typical nest site is a natural hole, usually in a tree but also on a cliff. However, any hole of the right size and situation will do: cavities in the roofs of houses and farm buildings are especially popular, and on occasions, it even nests in letterboxes.

The breeding season begins in April. The male chooses his nest site and starts to build the nest a bulky affair of dried grasses decorated with fresh green vegetation and the petals of spring flowers. The breeding season is the only time of year when starlings are territorial.

The male defends a small territory around his nest site, but other breeding pairs are tolerated only a few yards away. Once the male has built his nest he tries to attract a female by flying inside the nest hole and singing. Once the male has a mate, she completes the nest, lining the cup with material that can range from fine grasses and feathers to string and cellophane.

Eggs and Young

Between three and six eggs may be laid, though the usual clutch is five. The eggs are small, about 3cm (1in) long, and clear pale blue or blue-green with no markings. Incubation is carried out mostly by the female and takes about 11 days. At first, the young chicks are blind and without any feathering, save for a few tufts of down.

But the chicks grow quickly since they are fed by both parents on a protein-rich diet of invertebrates; in the first 12 days their weight increases from 5g (oz) to 60g (20z). After the twelfth day they virtually cease to add weight, but their feathers begin to develop rapidly and by the time the chicks are 21 days old they are ready to leave the nest.

In most years the parents begin a second clutch of eggs. Between the first and second broods, starlings often swap partners. The female birds are moving on to join the males at the other nests. And the situation is further complicated by the fact that a few male starlings are polygamous, having two females occupying nearby nests.

Mimicry in birds

The starling's song is not particularly musical but it is remarkable for its mimicry. Sometimes it mimics phrases from the songs of neighboring starlings, but it can also mimic the calls of other birds, including bullfinches, curlews, tawny owls, and green woodpeckers. It can even imitate mammal noises-as well as inanimate sounds, such as telephones ringing.

Ornithologists have discovered that, with some species, if a male possesses a wide repertoire of songs it has a better chance of breeding successfully. This explains why starlings make such a variety of noises but not why they mimic 'foreign' sounds rather than create their own distinct sounds. That remains a mystery.

Starlings are closely related to those master-mimics, the mynah birds. Unlike the mynahs, however, starlings cannot imitate human speech. Mimicry is not confined to the starling family: parrots and jackdaws reproduce words, and many species imitate other birds.


Read More – The Curlew Bird and Its Cousin
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Monday, 1 June 2020

Why the change in wife's behavior?


A rebellious wife who sniffed her husband's nose, and forbade him to live by her style and affairs. One day she woke up her husband early in the morning and said with great respect and love, My Sartaj; Get up, it's morning. And then she brought a nicely prepared breakfast to her husband's bed.

The husband, who had already woken up and was amazed at his wife's behavior, could not keep quiet after breakfast and asked, "What happened to you today?" How has it suddenly changed in you?

The wife said that the women who were preaching came to the neighbour's house yesterday. He said that Allah will forgive the man whose wife is immoral and immoral and may admit him to Paradise for enduring his wife's immorality and immorality.

The husband said, "So far so good, go ahead?" The wife growled and said, "If you want to go to heaven, then go away from your deeds. Why do you become a messiah and go because of me. 

Thursday, 27 February 2020

How Starling Get Their Name?

group of starlings is called a “murmuration,” presumably because of their mingled chatter when they roost in thousands. Then they take off again, turning in unison through the skies, like one huge bird or millions of twirling stars. The starling’s Anglo-Saxon name was staer. The “ing” suffix, a diminutive, was added later to form “starling.” Some etymologists connect the name with a celestial star: In winter starlings have a speckled, or “starry,” plumage, later replaced by glossy black; and when they fly they look a bit “star-shaped” from beneath. “Sterling” silver could, it is thought, also be connected with starlings, from Edward the Confessor’s silver coins, which were marked with four birds. exterminated. 

Ornithologists on each side heatedly attacked one another, and the vituperative public argument became known as the “Sparrow War.” But the sparrows were here to stay. Even though in 1899, the American Ornithologists Union rejected the “eligibility” of the house sparrow to be an “American” bird, it finally had to be added to the checklist in 1931. The number of house sparrows decreased somewhat when horses were replaced by automobiles, but this immigrant is now one of our most ubiquitous birds. The Venerable Bede compared the human soul to a little “sparrow,” flitting through a hall: “It enters in at one door and quickly flies out through the other. 

So this life of man appears but for a moment; what follows or indeed what went before, we know not at all.” Not only God but ornithologists too count hairs— or feathers. In 1933 Alexander Wetmore published The Number of Feathers in the English Sparrow, which reported that, not including the downy under feathers, the number varied seasonally, from 1,339 to 3,332. Far from being irrelevant, the number of “sparrow’s” feathers can have taxonomic importance. Most of the New World birds we call “sparrows” have nine primary wing feathers and belong to the Ember - izidae family (see Bunting). 

They are not related to Eurasian sparrows, which have ten primary wing feathers and are in the Passeridae family. Some Old World sparrows, however, were introduced to America and elsewhere, thriving so well they now seem like natives. The most notable is the house sparrow, sometimes (inaccurately) called the English sparrow. It was introduced to North America in the nineteenth century, and in 1871 Marianne North, a Victorian lady traveler and artist, wrote, “In and about all the great towns of the States I saw little houses built for the accommodation of sparrows; the birds had been imported from England to get rid of a caterpillar. 

The sparrows seemed to take kindly to their new homes and diet, but it was still a problem how they would endure the winter.” Not only did they endure, but they also multiplied, soon becoming pests, and Americans were divided as to whether they should be

Tuesday, 25 February 2020

How Northern Cardinal Get Their Name?

Early settlers simply called the northern cardinal, which is unique to North America, “the Red Bird.” It was frequently captured and put in cages, where both males and females would sing “exceedingly sweet,” unless “they would die with grief,” wrote eighteenth-century naturalist Peter Kalm. Our common northern cardinal, Cardinalis cardinalis, was initially Loxia cardinalis. Loxos, Greek for “crossroads” (so “crosswise” or “crooked”), was for its curved conical beak which the cardinal uses to crush grains and seeds, rather than peeling them, as weaker-billed birds must.

The name “cardinal” comes from the officials of the Catholic church, who traditionally wore bright red, a sign of affluence and power. Before synthetic dyes, red was an expensive color to obtain because it was derived from the rare cochineal insect. Subsequently, only the elite could afford red garments. These powerful ecclesiastics got their name from the Latin cardo, or “hinge.” The balance of significant ideas often “hinged” on the judgment of powerful church officials, and indeed sins or virtues could become “cardinal” too.

The cardinal family grouping has been changed several times, and it still isn’t always consistent. Cardinals are now generally grouped with grosbeaks (from the French gros, “large,” and bee, “beak”) and buntings. The family name is Cardinalidae. Older books may call the cardinal Ricbmondena caidinalis, after Charles Wallace Richmond, who spent most of his life working in Washington. He had become interested in birds when, at the age of thirteen, he was a page in the House of Representatives and was allowed access to books in the Library of Congress.

While studying for a degree in medicine, he took a job as a night watchman at the United States National Museum, and gradually advanced until he became assistant curator, residual there until he died in 1932. Although he made a card index of all the known birds and was greatly appreciated by his generations, he is not much recognized these days. His former namesake, though, was the first bird in the United States to be given official state recognition when in 1926it was designated as the state bird of Kentucky. Now it’s the bird of seven states. This peak of the avian hierarchy is (nomenclatorial speaking) an unclear separation of church and state but, yet, unchallenged.
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What is Cardinal Bird Meaning?

Northern Cardinal bird a representative of a loved one who has passed away. Therefore, when you want to see him, it means they are visiting your door very soon. Normally showing up when you most need them or miss a lot. They also make an appearance during the times of celebration as well as despair to let you know they will always be with you. Some people believe this story, however, some’s don’t and called it superstitions.

Cardinal Bird Meaning in terms of spiritual is known for being a seer and messenger with his head’s crest. The vibrant red color is interconnected with East Compass point, the start of spring maybe can take messages to you from the spiritual world. Another myth of when cardinal crosses your path, then it means romantic relationship ahead in future or experience renewed romance and courtship. In the Bible, Red Cardinal Meaning peace and purity in the light of the spirit. Many people believe, the cardinal bird comes in some unusual circumstances and brings potent messages. The cardinal bird symbolizes virtue, purity, love, responsibility, and balance.

The red bird is also called monogamous birds, that is so romantic, harmonious, and full of songs. Some people believe, if you see cardinal flying towards the sun, it will bring good luck to you. Although red cardinals are common, yellows are one in million bird. The northern cardinal scientific name is Cardinalis cardinalis, is also known colloquially as the redbird. Both male and female birds like to sing in a louder string of clear two parted whistles and morphological ability to vary their song.

The cardinals seldom used extensive frequency modulation in their songs. Differential singing behavior of this nature probably enhances long-distance communication by minimizing excessive reverberation from canopy foliage. Some of the differences in dialects may be the result of selective pressures exerted by the acoustics of the environment. Cardinals are colorful, tolerant of people, have pleasant calls, and are easily attracted to bird feeders. That has made them a favorite of backyard birdwatchers all over the eastern half of the United States. Their eye-catching bright plumage brings color to our yards during the winter when many other species have flown south.
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Thursday, 20 February 2020

Mount Pinatubo, Philippines, Volcanic Eruption

On June 15, 1991, and persisting for eight hours, the second-largest volcanic eruption of the twentieth century, that of Mount Pinatubo, took place on the island of Luzon in the Philippines. The largest eruption was Katmai in Alaska in 1912. Pinatubo is only fifty-five miles from the capital city, Manila. As many as eight hundred people were killed and 100,000 became homeless following the eruption. Millions of tons of sulfur dioxide were discharged into the atmosphere, causing a decrease in the surface temperature of the entire globe over the next few years. 

Mount Pinatubo is part of a chain of volcanoes along the Luzon arc on the west coast of the main island of the Philippines, Luzon, created by subduction action of tectonic plates like the way the volcanic mountains of Cascadia develop, such as Mount St. Helens. The events of 1991 the eruption began back in July 1990, when a magnitude 7.8 earthquake occurred sixty-two miles northeast of the Pinatubo region, a result of the reawakening of Mount Pinatubo. In mid-March 1991, villagers around Mount Pinatubo began feeling earthquakes and volcanologists began to study the mountain. About 30,000 people lived in villages on the flanks of the volcano prior to the disaster. 

On April 2, 1991, small explosions from the mountain led to eruptions of ash that was deposited on local villages. The first evacuations of 5,000 people were ordered later that month. Before the catastrophic eruption of 1991, Pinatubo was not a dominant landmark, unknown to most people in the surrounding areas. Its summit was 5,725 feet above sea level, but only about 1,800 feet above nearby plains, and only about six hundred feet higher than surrounding peaks, which largely obscured it from view. An indigenous people, the Aeta, had lived on its slopes and in surrounding areas for several centuries, having fled the lowlands to escape persecution by the Spanish. 

They were a hunter-gatherer people who were extremely successful in surviving in the dense jungles of the area. The dense jungle that covered most of the mountain and surrounding peaks supported the hunter-gathering Aeta, while on the surrounding low-lying areas the abundant rainfall provided by the monsoon climate and the fertile volcanic soils provided excellent conditions for agriculture. Many people grew rice and other staple foods. Many of the Aeta who lived on the slopes of the volcano left the villages of their own volition when the first explosions began in April, gathering in a village about eight miles from the summit. They moved to increasingly distant villages as the eruptions escalated, some moving as much as nine times in the two months preceding the eruption.

Earthquakes and explosions continued to occur. On June 5, a level 3 alert was issued for two weeks due to the possibility of a major eruption. The extrusion of a lava dome on June 7, led to the issuance of a level 5 alert on June 9, indicating an eruption in progress. An evacuation area twelve miles away from the volcano was established and 25,000 people were evacuated. On June 10, Clark Air Base, a U.S. military installation near the volcano, was evacuated. The 18,000 personnel and their families were transported to Subic Bay Naval Station and most were returned to the United States. On June 12, the danger radius was extended to eighteen miles from the volcano and this involved increasing the total numbers evacuated to 58,000. 

Unfortunately, at the time of the eruption, Tropical Storm Yunya was passing forty-seven miles to the northeast of Mount Pinatubo, causing a large amount of rainfall in the region. The ash that was ejected from the volcano mixed with the water vapor in the air to cause deposits of rock and ash to fall across the whole of the island of Luzon. Many of the eight hundred people who died during the eruption were killed by the weight of the ash collapsing roofs and killing occupants. Had Tropical Storm Yunya not been nearby, the death toll from the volcano would have been much lower.


The volcano had experienced major eruptions in the past, the last being about five hundred years ago. Pinatubo stood about 5,725 feet above sea level before the June 1991 eruption. On June 15, the climactic eruption of Mount Pinatubo began in the early afternoon and lasted for nine hours, causing numerous earthquakes due to the collapse of the summit of Mount Pinatubo and the creation of a caldera. 

The caldera reduced the peak from 5,725 feet to 4,872 feet. In addition to the ash, Mount Pinatubo ejected between fifteen and thirty million tons of sulfur dioxide gas. Sulfur dioxide in the atmosphere mixes with water and oxygen in the atmosphere to become sulfuric acid, which in turn triggers ozone depletion. Over 90 percent of the material released from the volcano was ejected during the nine-hour eruption of June 15. The human impacts of the disaster are staggering. In addition to the up to eight hundred people who lost their lives, there was almost one half of a billion dollars in property and economic damage. The economy of central Luzon was completely disrupted, the volcano has destroyed 4,979 homes and damaged another 70,257. 

One year after the eruption thousands of additional homes were destroyed and 3,137 were damaged, usually as a result of rain-induced torrents of volcanic debris. The eruption plume of Mount Pinatubo’s various gasses and ash reached high into the atmosphere within two hours of the eruption, reaching an altitude of twenty-one miles and covering an area 250 miles wide. This eruption was the largest disturbance of the stratosphere since the eruption of Krakatau in 1883. It had a Volcanic Explosivity Index (VEI) of 6, making it equivalent to some of the most violent eruptions in all human history. Mount Vesuvius, Krakatau, and Thera of ancient Greece all had VEI of 6.

The aerosol cloud spread around the earth in two weeks and covered the planet within a year. During 1992 and 1993, as a result of this aerosol cloud, the ozone hole over Antarctica reached an unprecedented size, creating a heightened risk of skin cancer all over the world. The cloud over the earth reduced global temperatures. In 1992 and 1993, the average temperature in the Northern Hemisphere was greatly reduced and the entire planet experienced its minimum temperature in August 1992. 

Overall, the cooling effects of Mount Pinatubo’s eruption were greater than those of the El Nino climatic event that coincided with the aftermath of the eruption. Pinatubo’s cooling effects were also much greater in the years 1992 and 1993 than the increases that were accumulating due to human actions via greenhouse gases. The United States military never returned to Clark Air Base. 

The damaged base was turned over to the Philippine government on November 26, 1991. In all, the eruption ejected about two and a half cubic miles of material into the atmosphere. Damage to health care facilities, and the spread of illnesses in relocation facilities, led to soaring death rates in the months following the eruption. Education for thousands of children was seriously disrupted by the destruction of schools in the eruption.
Aerial view of the north side of Pinatubo crater with a small explosion in progress on June 22, 1991. (1)
Aerial view of the north side of the Pinatubo crater with a small explosion in progress on June 22, 1991.
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