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Side-by-Side Comparison

Attribute	Blackish Oystercatcher	Chatham Islands Oystercatcher
Scientific Name	Haematopus ater	Haematopus chathamensis
Order	Charadriiformes	Charadriiformes
Family	Haematopodidae	Haematopodidae
Conservation Status	Least Concern	Endangered
Length	—	—
Wingspan	50.9 cm (20.0 in)	50.4 cm (19.8 in)
Weight	717.5 g (25.31 oz)	580.0 g (20.46 oz)
Diet	--	--
Clutch Size	1-3	2-3
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🏖️ Coastal

Blackish Oystercatcher only

None

Chatham Islands Oystercatcher only

None

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Conservation Status

Least Concern

Blackish Oystercatcher

Endangered

Chatham Islands Oystercatcher

{# ════════════════════════════════════════════════════════════════════════ Identification Tips — How to Tell Them Apart ════════════════════════════════════════════════════════════════════════ #} {# ════════════════════════════════════════════════════════════════════════ About Each Bird (Descriptions) ════════════════════════════════════════════════════════════════════════ #}

About These Birds

Blackish Oystercatcher

Blackish Oystercatcher (Haematopus ater) is a large 42–46 cm entirely dark oystercatcher of the Pacific coast of South America. Sooty black-brown plumage; orange-red bill; pale pinkish legs. Inhabits rocky coasts and offshore islands from Peru south through Chile to Tierra del Fuego and the Falkland Islands.

Chatham Islands Oystercatcher

Chatham Islands Oystercatcher (Haematopus chathamensis) is a large 47–49 cm oystercatcher endemic to the Chatham Islands, New Zealand. Black and white patterning; orange-red bill; pink legs. Critically Endangered; world population only ~440 birds. Inhabits rocky shores and sandy beaches on the Chatham Islands.

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