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Oystercatcher chicks and eggs. Nearly all species of oystercatcher are monogamous, although there are reports of polygamy in the Eurasian oystercatcher. They are territorial during the breeding season (with a few species defending territories year round). There is strong mate and site fidelity in the species that have been studied, with one ...
The American oystercatcher (Haematopus palliatus), occasionally called the American pied oystercatcher, is a member of family Haematopodidae. Originally called the "sea pie", it was renamed in 1731 when naturalist Mark Catesby claimed that he had observed the bird eating oysters. [ 2 ]
The Eurasian oystercatcher (Haematopus ostralegus) also known as the common pied oystercatcher, or (in Europe) just oystercatcher, is a wader in the oystercatcher bird family Haematopodidae. It has striking black and white plumage, a long straight orange-red bill, red eyes and relatively short dull pink legs.
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Nest and chick predators are mainly kelp gulls, silver gulls, swamp harriers, Australian magpies, skuas, mustelids, dogs, cats and possibly rats (Marchant, 1993). The variable oystercatcher has issues with disturbance from human activity which damages nests. [11]
Incubation takes around 26–28 days. The chicks are capable of leaving the nest after one day, but stay in the territory for a long time after fledging (apx. 40 days). Fledged juveniles stay in the territory until the next breeding season. If the parents migrate, that year's chicks may migrate with them, most commonly in the north of the range.
The lifespan of an African oystercatcher is about 35 years, of which they are known to pair up for 25 years. Although adults are rarely predated, most mainland egg and chick fatalities are due to disturbance by people, off-road vehicles, dog attacks and predation by the kelp gull (Larus dominicanus) and other avian predators. [1]
The population is believed to be stable; the IUCN rates the Chatham Islands oystercatcher as "Endangered", and the Department of Conservation as "Nationally Critical". [5] The main threats faced by this bird are predation, particularly by feral cats on eggs and chicks, and the cattle and sheep which roam onto the beaches and may trample the nests.