A photo of a Wedge-rumped Storm Petrel (Hydrobates tethys)
Wedge-rumped Storm Petrel

Wedge-rumped Storm Petrel

Hydrobates tethys

The wedge-rumped storm petrel (Hydrobates tethys) is a storm petrel. It breeds in the Galápagos Islands and on the coast of Peru. It was formerly defined in the genus Oceanodroma before that genus was synonymized with Hydrobates. Swinhoe's storm petrel is a small bird, 18–21 cm in length with a 45–48 cm wingspan, though distinctly larger than the European storm petrel. It is essentially dark brown in all plumages, and has a fluttering flight, pattering on the water surface as it picks planktonic food items from the ocean surface. Unlike the European storm petrel, it does not follow ships. In structure it most resembles a Leach's storm petrel with its forked tail, longish wings, and flight behaviour, but does not have a white rump and the call differs. It is difficult to distinguish from other all-dark Hydrobates species, and the first English record had to be DNA-tested to eliminate the possibility that it was a Leach's storm petrel, since populations of north-eastern Pacific Leach's storm petrels contain individuals that show completely dark rumps.
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Wedge-rumped Storm Petrels on Birda

Sightings

A map showing the sighting location
🦢
Lucas Corneliussen
Friday 18 Jun 2021 - 6:30am
Costa Rica
A map showing the sighting location
🦢
Lucas Corneliussen
Thursday 17 Jun 2021 - 6:30am
Costa Rica
A map showing the sighting location
🦢
Lucas Corneliussen
Saturday 24 Feb 2018 - 7:30am
Costa Rica
A map showing the sighting location
🦢
Ed Jenkins
Sunday 03 May 2015 - 12:00am
United States
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