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Side-by-Side Comparison

Attribute	Balearic Shearwater	Black-vented Shearwater
Scientific Name	Puffinus mauretanicus	Puffinus opisthomelas
Order	Procellariiformes	Procellariiformes
Family	Procellariidae	Procellariidae
Conservation Status	Critically Endangered	Near Threatened
Length	—	—
Wingspan	48.4 cm (19.1 in)	46.6 cm (18.3 in)
Weight	514.8 g (18.16 oz)	420.5833333333333 g (14.84 oz)
Diet	--	--
Clutch Size	1	1
Population Trend	—	—

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Habitat Comparison

Shared Habitats

🏖️ Coastal

Balearic Shearwater only

None

Black-vented Shearwater only

None

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Conservation Status

Critically Endangered

Balearic Shearwater

Near Threatened

Black-vented Shearwater

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About These Birds

Balearic Shearwater

30–38 cm. Brown above; variably dirty-white to brown below; often shows brown smudging on flanks. Breeds only Balearic Islands, Spain. Critically Endangered with fewer than 3,000 pairs; faces extinction. Migrates to NE Atlantic; threatened by predators, fishing bycatch, and tourist development.

Black-vented Shearwater

30–38 cm. Dark above with blackish undertail and vent; white below. Breeds islands off Baja California; ranges offshore in eastern Pacific to Peru. Near Threatened; affected by introduced predators on breeding islands. Feeds on fish; often seen from Baja California shore.

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