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Side-by-Side Comparison

Attribute	Hawaiian Petrel	Balearic Shearwater
Scientific Name	Pterodroma sandwichensis	Puffinus mauretanicus
Order	Procellariiformes	Procellariiformes
Family	Procellariidae	Procellariidae
Conservation Status	Endangered	Critically Endangered
Length	—	—
Wingspan	54.3 cm (21.4 in)	48.4 cm (19.1 in)
Weight	479.5 g (16.91 oz)	514.8 g (18.16 oz)
Diet	--	--
Clutch Size	1	1
Population Trend	—	—

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Habitat Comparison

Shared Habitats

None

Hawaiian Petrel only

🌲 Forest 🌾 Grassland

Balearic Shearwater only

🏖️ Coastal

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Conservation Status

Endangered

Hawaiian Petrel

Critically Endangered

Balearic Shearwater

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About These Birds

Hawaiian Petrel

43 cm. Dark above with white forehead; white below with dark partial collar and carpal bar. Breeds high-elevation burrowing colonies on Hawaiian mountains. Vulnerable; threatened by introduced predators, light attraction, habitat loss. Migrates to northeast Pacific after breeding.

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.

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