African oystercatcher
The African oystercatcher or African black oystercatcher is a large charismatic wader resident to the mainland coasts and offshore islands of southern Africa. This oystercatcher has a population of over 6,000 adults, which breed between November and April. The scientific name moquini commemorates the French naturalist Alfred Moquin-Tandon who discovered and named this species before Bonaparte.
Description
The African oystercatcher is a large, noisy wader, with completely black plumage, red legs and a strong broad red bill. The sexes are similar in appearance, however, females are larger and have a slightly longer beak than males. Juveniles have soft grey plumage and do not express the characteristic red legs and beak until after they fledged. The call is a distinctive loud piping, very similar to Eurasian oystercatchers. As the Eurasian oystercatcher is a migratory species they only occur as a vagrant in southern Africa, and its black-and-white plumage makes confusion impossible.Average measurements
Body Length:Wingspan:
Mass: ♂ ♀
Tarsus:
'''Culmen:'''
Distribution and habitat
The African oystercatcher is native to the mainland coasts and offshore islands of Southern Africa. Its breeding range extends from Lüderitz, Namibia to Mazeppa Bay, Eastern Cape, South Africa, with dispersal in winter north to southern Angola and southern Mozambique. There are estimated to be over 6,000 adult birds in total. There is one record of a vagrant from Gambia, a specimen from 1938 in the British Museum which proved to be H. moquini on genetic analysis after previously being considered unidentified or possibly a Canary Islands oystercatcher H. meadewaldoi.Typically sedentary African oystercatchers rarely leave their territories, which include a nesting site and feeding grounds. These will usually be located on or near rocky shores where they can feed.
Ecology
Feeding
African oystercatchers predominantly feed on molluscs such as mussels and limpets, although they are known to also feed on polychaetes, insects and potentially even fish. They are adapted to pry open mussels and loosen limpets off the rocks but have been recorded picking through sand to locate other food items.Breeding
The nest is a bare scrape on pebbles, sand or shingle within about of the high-water mark. On rock ledges there may be a rim of shells to keep the eggs in place. The female generally lays two eggs, but there may be one or three, which are incubated by both adults. The incubation period varies between 27 and 39 days and the young take a further 38 or so days to fledge. Breeding success is greater on offshore islands where there are few predators and less disturbance than mainland sites.The eggs average about in length, ranging from, and have a breadth of, ranging from.