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Side-by-Side Comparison

Attribute	Ashy Storm-petrel	Least Storm-petrel
Scientific Name	Hydrobates homochroa	Hydrobates microsoma
Order	Procellariiformes	Procellariiformes
Family	Hydrobatidae	Hydrobatidae
Conservation Status	Endangered	Least Concern
Length	—	—
Wingspan	26.6 cm (10.5 in)	23.8 cm (9.4 in)
Weight	36.333333333333336 g (1.28 oz)	18.0 g (0.63 oz)
Diet	--	--
Clutch Size	1	1
Population Trend	—	—

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Conservation Status

Endangered

Ashy Storm-petrel

Least Concern

Least Storm-petrel

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About These Birds

Ashy Storm-petrel

Ashy Storm-petrel, 19–21 cm, is restricted to the California Current of the eastern Pacific; breeding on Channel Islands and the Farallon Islands. Entirely ashy brown without white rump — uncommon among storm-petrels. Endangered; less than 10,000 individuals; threatened by light pollution and introduced predators.

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.

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