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Side-by-Side Comparison

Attribute	Least Storm-petrel	Tristram's Storm-petrel
Scientific Name	Hydrobates microsoma	Hydrobates tristrami
Order	Procellariiformes	Procellariiformes
Family	Hydrobatidae	Hydrobatidae
Conservation Status	Least Concern	Least Concern
Length	—	—
Wingspan	23.8 cm (9.4 in)	35.5 cm (14.0 in)
Weight	18.0 g (0.63 oz)	89.0 g (3.14 oz)
Diet	--	--
Clutch Size	1	1
Population Trend	—	—

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Conservation Status

Least Concern

Least Storm-petrel

Least Concern

Tristram'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.

Tristram's Storm-petrel

Tristram's Storm-petrel, 24–25 cm, is one of the largest storm-petrels, breeding on small Hawaiian and Ogasawara Islands in the North Pacific. All dark; broad wings, moderate tail fork. Nocturnal at colonies in winter (October–April). Planktivore; poorly known at sea; winters south into tropical Pacific.

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