Great Shearwater vs Collared Petrel
Ardenna gravis compared with Pterodroma brevipes
Side-by-Side Comparison
| Attribute | Great Shearwater | Collared Petrel |
|---|---|---|
| Scientific Name | Ardenna gravis | Pterodroma brevipes |
| Order | Procellariiformes | Procellariiformes |
| Family | Procellariidae | Procellariidae |
| Conservation Status | Least Concern | Vulnerable |
| Length | — | — |
| Wingspan | 63.6 cm (25.0 in) | 42.4 cm (16.7 in) |
| Weight | 832.5 g (29.37 oz) | 137.0 g (4.83 oz) |
| Diet | -- | -- |
| Clutch Size | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Great Shearwater
Vulnerable
Collared Petrel
About These Birds
Great Shearwater
43–51 cm, wingspan 105–122 cm. Large; dark brown above with white underparts, dark cap, and distinctive scaly pattern on upperwing. Breeds Tristan da Cunha, Gough, and Falklands; migrates to North Atlantic. Feeds on fish and squid; spectacular post-breeding migration past UK coasts.
Collared Petrel
30 cm. Polymorphic; pale morph has grey collar band contrasting with white breast; dark morph sooty grey. Breeds Fiji, Vanuatu, Tonga, Samoa. Vulnerable; threatened by introduced predators. Ranges in tropical South Pacific; feeds on squid and fish.