Ecology

Habitat

Habitat and Ecology

Systems
  • Terrestrial
  • Freshwater
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
BirdLife International

Reviewer/s
Butchart, S. & Symes, A.

Contributor/s

Justification
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
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Population

Population
The global population size has not been quantified, but the species is reported to be common or abundant but often very localised (Madge and Burn 1993).

Population Trend
Increasing
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Wikipedia

Cape Crow

The Cape Crow or Black Crow (Corvus capensis) is slightly larger (48–50 cm in length) than the Carrion Crow and is completely black with a slight gloss of purple in its feathers. It has proportionately longer legs, wings and tail too and has a much longer, slimmer bill that seems to be adapted for probing into the ground for invertebrates. The head feathers have a coppery-purple gloss and the throat feathers are quite long and fluffed out in some calls and displays.

Distribution and habitat[edit]

This species occurs in two large separate regions of the African continent. One form ranges from the Cape at the southern tip of Africa up to southern Angola and across to the east coast of Mozambique. The other population occurs in a large area from Sudan, Ethiopia,Tanzania and Kenya in central east Africa. The more northern population is on average slightly smaller than the southern. It inhabits open grassland, moorland, agricultural areas with some trees or woodland in the vicinity for nesting. It seems to thrive especially in agricultural areas.

Behaviour[edit]

Diet[edit]

As far as feeding is concerned, it eats grain and other seeds, invertebrates which it digs for with powerful downward stabs of its long bill. It opens corncob kernels before they are fully ripe, bulbs and fleshy roots of certain plants, frogs and small reptiles, fruits and berries. It takes the eggs and chicks of ground nesting birds and has been known to kill birds of up to a pound in weight (especially domestic poultry). It turns over the droppings of mammals for insects.

Nesting[edit]

Nesting is always in trees, usually near the top. It has been known to nest in shrubs but much less frequently. There are usually 3-4 eggs incubated over 18–19 days and fledged by around 38 days. Usually only 3 nestlings survive.

Voice[edit]

The voice is describes as a "krrah.....krrah.....krrah" or a quicker "kah-kah-kah". It also make very loud, liquid bubbling sounds that carry quite a distance and also gives throaty chuckles. There is evidence that vocal mimicry is practised too.

References[edit]

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