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Side-by-Side Comparison

Attribute	Least Storm-petrel	Wedge-rumped Storm-petrel
Scientific Name	Hydrobates microsoma	Hydrobates tethys
Order	Procellariiformes	Procellariiformes
Family	Hydrobatidae	Hydrobatidae
Conservation Status	Least Concern	Least Concern
Length	—	—
Wingspan	23.8 cm (9.4 in)	26.0 cm (10.2 in)
Weight	18.0 g (0.63 oz)	27.0 g (0.95 oz)
Diet	--	--
Clutch Size	1	1
Population Trend	—	—

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Conservation Status

Least Concern

Least Storm-petrel

Least Concern

Wedge-rumped Storm-petrel

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About These Birds

Least Storm-petrel

World's smallest seabird at 13–15 cm. Sooty-black with white rump; short rounded wings. Breeds Baja California islands; ranges offshore in eastern Pacific to Ecuador. Feeds on zooplankton and small fish by pattering on the surface. Nocturnal at breeding colonies; Near Threatened.

Wedge-rumped Storm-petrel

Wedge-rumped Storm-petrel, 19–21 cm, breeds in enormous colonies in the Galápagos and on islands off Peru. The largest white rump patch of any storm-petrel — nearly triangular, extending to the uppertail coverts. Unlike most storm-petrels, daytime activity at colonies. Planktivore in eastern Pacific upwelling.

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