Cory's Shearwater vs Balearic Shearwater
Calonectris borealis compared with Puffinus mauretanicus
Side-by-Side Comparison
| Attribute | Cory's Shearwater | Balearic Shearwater |
|---|---|---|
| Scientific Name | Calonectris borealis | Puffinus mauretanicus |
| Order | Procellariiformes | Procellariiformes |
| Family | Procellariidae | Procellariidae |
| Conservation Status | Least Concern | Critically Endangered |
| Length | — | — |
| Wingspan | 69.4 cm (27.3 in) | 48.4 cm (19.1 in) |
| Weight | 787.5 g (27.78 oz) | 514.8 g (18.16 oz) |
| Diet | -- | -- |
| Clutch Size | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Cory's Shearwater
Critically Endangered
Balearic Shearwater
About These Birds
Cory's Shearwater
46–56 cm, wingspan 112–126 cm. Large shearwater; greyish-brown above with yellowish bill; white below with pale underwing. Breeds Macaronesia (Azores, Canaries, Madeira). Migrates across Atlantic to South Atlantic wintering grounds. Feeds on fish and squid; follows fishing vessels.
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.