Bird Guide

Sooty Oystercatcher vs Variable Oystercatcher

Sooty Oystercatcher (Haematopus fuliginosus)

Sooty Oystercatcher

Haematopus fuliginosus

Large819 gCoastal

Measuring 42 to 52 cm (16.5 to 20.5 in) long with a bill length of 5–8 cm (2–3 in), the sooty oystercatcher has all black plumage, with pink-red legs and scarlet or orange-red bill and eyes. The heaviest of all oystercatchers, the sooty oystercatcher weighs up to 980 g (2.16 lb), averaging around 819 g (1.806 lb), with females larger and heavier in both subspecies. Males have shorter, thicker bills and females have longer, thinner bills. The 19% average difference in length is the most marked of any oystercatcher species.

ID text from Wikipedia, CC BY-SA 4.0

Photo: patrickkavanagh · CC BY 2.0
Variable Oystercatcher (Haematopus unicolor)

Variable Oystercatcher

Haematopus unicolor

Large671 gCoastal

"Variable" refers to the frontal plumage, which ranges from pied through mottled to all black. They are polymorphic meaning they have different genetic variants. These color differences are attributed to the latitude of the habitat, where the northernmost oystercatchers have significantly more white on their bodies than those of southern origin. All Stewart Island variable oystercatchers are black. They have pink legs, an orange eye ring and orange-red beaks. Similar to a needle in shape, the bill is thin and long, and darkens to a deep red color during the breeding season. Voice: When in flight they make a high pitched 'kleep kleep' sound.

ID text from Wikipedia, CC BY-SA 4.0

Sonogram of the Variable Oystercatcher
Recorded by craig wilson · Nocturnal flight call · North West Bay, Marlborough District, Marlborough, New Zealand · CC BY 4.0
Photo: Bernard Spragg. NZ from Christchurch, New Zealand · Public domain

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Photos and recordings are credited to their authors under the licence shown. Full profiles: Sooty Oystercatcher and Variable Oystercatcher.