Tuesday, 19 January 2021
What Makes Owls So Wonderful
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?
Thursday, 27 February 2020
How Starling Get Their Name?
Tuesday, 25 February 2020
How Northern Cardinal Get Their Name?
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Thursday, 20 February 2020
Mount Pinatubo, Philippines, Volcanic Eruption
Friday, 14 February 2020
The Domestication of a Horse
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Friday, 7 February 2020
Sled Dogs Supply Soldiers - Alaska to the Alps
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