Bird Guide

Black Oystercatcher vs Variable Oystercatcher

Black Oystercatcher (Haematopus bachmani)

Black Oystercatcher

Haematopus bachmani

Large555 gCoastal

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. Its plumage varies slightly from north to south, being darker further north.

ID text from Wikipedia, CC BY-SA 4.0

Photo: TRinaud · CC BY 4.0
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: Black Oystercatcher and Variable Oystercatcher.