Hypothetical Seabird look-alikes
Hypothetical species
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Open the appSeveral birds can be mistaken for the Hypothetical Seabird. Compare the key differences below to confirm your sighting.
Birds to compare
Cape Petrel
Daption capense
Key differences
While also black and white, the Cape Petrel is smaller, has a distinctive checkered pattern on its back and wings, and a much smaller, all-black bill. The Hypothetical Seabird has a more solid black upperpart and a prominent white wing flash.
Giant Petrels
Macronectes spp.
Key differences
Giant Petrels are significantly larger, have a massive pale bill with a prominent nasal tube, and typically show more mottled or brownish plumage, especially juveniles. They also have a different flight profile, often appearing more hunched.
White-chinned Petrel
Procellaria aequinoctialis
Key differences
The White-chinned Petrel is entirely dark brown/black with a pale bill and a variable white chin patch. It lacks the stark black and white contrast and the prominent white wing flash of the Hypothetical Seabird.
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