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.
No comments:
Post a Comment