Black
Crowned Crane, Balearica pavonina
The Black Crowned Crane, Balearica pavonina, is a bird in
the crane family Gruidae. It was once called also Kaffir
Crane.
It occurs in dry savannah in Africa south of the Sahara, although
in nests in somewhat wetter habitats. There are two subspecies:
Balearica pavonina pavonina in the west and the more
numerous Balearica pavonina ceciliae in east Africa.
Black
Crowned Crane, Balearica pavonina
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This species and the closely related Grey Crowned Crane, Balearica
regulorum, which prefers wetter habitats for foraging,
are the only cranes that can nest in trees. It is about 1
m long, has a 1.87 m wingspan and weighs about 3.6 kg.
Like all cranes, the Black Crowned Crane eats grass, insects,
reptiles, and small mammals. It is endangered, especially
in the west, by habitat loss and degradation.
Source: http://en.wikipedia.org/wiki/Black_Crowned_Crane
The body of the Black
Crowned Crane is mostly black, with distinctive white upper
and under wing coverts. The head is
topped with a crown of stiff golden feathers. Cheek patches
are red and white. The subspecies are most easily distinguished
by the differences in the coloration of their cheek patches.
In the West African subspecies, the lower half of the cheek
patch
is red; in the Sudan subspecies, the red extends into the
upper half of the cheek patch. The gular sac under the chin
is small
and dark. The gular sac is similar to a wattle, except that
it can be inflated. Legs, toes, and bill are black.
All crowned cranes have the ability to perch because their
long hind toe (hallux) allows for grasping. Males and females
are virtually indistinguishable, although males tend to be
slightly larger.
Black Crowned Cranes use both wet and dry open habitats, but
prefer freshwater marshes, wetter grasslands, and the
edges of water bodies. Black Crowned Cranes are considered
both year-round residents and local migrants, flocking
during the dry non-breeding season.
The Black Crowned Crane's circular nest platforms are built
of grasses and sedges within or along the edges of densely
vegetated wetlands. Females lay 2-5 eggs and incubation (by
both sexes) lasts 28-31 days. Both parents guard the nest.
When the female leaves the nest to forage, the male often
guards by perching on a nearby tree. The male will sound an
alarm call if a threat is perceived. Chicks fledge (first
flight) at 60-100 days.
Threats:
Illegal capture and trade for the pet industry is the
most serious threat to Black Crowned Cranes. There is
an ancient
tradition in West African countries such as Mali, to
keep domesticated Black Crowned Cranes at household
compounds . However, in the past 30 years, international
trade in the species has accelerated. Other threats
facing the
Black Crowned Crane are the loss, transformation, and
degradation of habitat. In West Africa, wetlands and
grasslands
have been devastated by natural forces (drought) and
by the intensification of human land use
(overgrazing, destruction of tree cover.) |
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When nothing else stated, all pictures courtesy
of
International Crane Foundation, Baraboo, Wisconsin. www.savingcranes.org
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