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Side-by-Side Comparison

Attribute	Least Storm-petrel	Townsend's Storm-petrel
Scientific Name	Hydrobates microsoma	Hydrobates socorroensis
Order	Procellariiformes	Procellariiformes
Family	Hydrobatidae	Hydrobatidae
Conservation Status	Least Concern	Endangered
Length	—	—
Wingspan	23.8 cm (9.4 in)	30.1 cm (11.9 in)
Weight	18.0 g (0.63 oz)	33.2 g (1.17 oz)
Diet	--	--
Clutch Size	1	1
Population Trend	—	—

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Conservation Status

Least Concern

Least Storm-petrel

Endangered

Townsend's 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.

Townsend's Storm-petrel

Townsend's Storm-petrel, 19–21 cm, breeds on Guadalupe and San Benedicto Islands off western Mexico. Recently split from Leach's Storm-petrel. Forked white rump, dark overall. Pelagic in eastern Pacific; planktivore. Conservation status uncertain; threatened by introduced predators at small nesting island colonies.

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