Leach's Storm-Petrel

Oceanodroma leucorhoa

Also known as: Leach's Petrel

20 cm (8") Fairly common off Pacific coast, uncommon off Atlantic. Similar to Wilson's Storm-Petrel but does not often flutter on water with pattering feet. Erratic butterfly-like flight. Also it has a forked tail and dark line dividing its white rump band which does not extend below the bird like in Wilson's.

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Credit: capecast