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Side-by-Side Comparison

Attribute	Least Storm-petrel	Monteiro's Storm-petrel
Scientific Name	Hydrobates microsoma	Hydrobates monteiroi
Order	Procellariiformes	Procellariiformes
Family	Hydrobatidae	Hydrobatidae
Conservation Status	Least Concern	Vulnerable
Length	—	—
Wingspan	23.8 cm (9.4 in)	30.6 cm (12.0 in)
Weight	18.0 g (0.63 oz)	45.5 g (1.60 oz)
Diet	--	--
Clutch Size	1	1
Population Trend	—	—

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Habitat Comparison

Shared Habitats

None

Least Storm-petrel only

None

Monteiro's Storm-petrel only

🏖️ Coastal

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Conservation Status

Least Concern

Least Storm-petrel

Vulnerable

Monteiro'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.

Monteiro's Storm-petrel

Monteiro's Storm-petrel, 19–21 cm, breeds exclusively on Graciosa Island in the Azores, wintering in the central North Atlantic. Recently split from Band-rumped Storm-petrel; breeds in a different season (July–November vs March–April for Castro's). Near Threatened; very small island-restricted population.

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More Birds to Explore

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Ainley's Storm-petrel Hydrobates cheimomnestes Ashy Storm-petrel Hydrobates homochroa Band-rumped Storm-petrel Hydrobates castro Black Storm-petrel Hydrobates melania All Hydrobatidae birds →

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