Credit: Don Loarie
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Least Storm-Petrel
Fork-tailed Storm-Petrel
Leach's Storm-Petrel
Band-rumped Storm-Petrel
Wedge-rumped Storm-Petrel
Black Storm-Petrel
Wilson's Storm-Petrel
20 cm (8") Fairly common in Pacific Ocean. Breeds off California. All dark storm-petrel with forked tail. Similar to Black Storm-Petrel but has rapid wingbeats and is overall paler.
Images
Credit: Jeff Poklen / USFWS
Credit: Marcel Holyoak