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The nest is a bare scrape on pebbles, on the coast or on inland gravelly islands. Two to four eggs are laid. On average the eggs are 57 mm × 40 mm (2.2 in × 1.6 in) in size and weigh 47 g (1.7 oz). They are buffish-yellow in colour with black-brown blotches and streaks.
The Eurasian oystercatcher is the lightest on average, at 526 grams (1 pound 2 + 1 ⁄ 2 ounces), while the sooty oystercatcher is the heaviest, at 819 g (1 lb 13 oz). [11] The plumage of all species is either all-black, or black (or dark brown) on top and white underneath.
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 ]
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The Magellanic oystercatcher has a length between 42 and 46 cm (17 and 18 in). The male weighs around 600 g (21 oz) and the female is a little heavier. [2] This bird has a long, orange beak, yellow eye and eye ring, and yellow legs.
The black oystercatcher is a large shorebird, with a black head, neck and breast and dark brown body, a long (9 cm (3.5 in)) bright red/orange bill and pink legs.It has a bright yellow iris and a red eye-ring.
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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 ]