Great Shearwater vs Small Saint Helena Petrel
Ardenna gravis compared with Bulweria bifax
Side-by-Side Comparison
| Attribute | Great Shearwater | Small Saint Helena Petrel |
|---|---|---|
| Scientific Name | Ardenna gravis | Bulweria bifax |
| Order | Procellariiformes | Procellariiformes |
| Family | Procellariidae | Procellariidae |
| Conservation Status | Least Concern | Extinct |
| Length | — | — |
| Wingspan | 63.6 cm (25.0 in) | — |
| Weight | 832.5 g (29.37 oz) | 167.17 g (5.90 oz) |
| Diet | -- | -- |
| Clutch Size | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Great Shearwater
Extinct
Small Saint Helena 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.
Small Saint Helena Petrel
Extinct; known only from subfossil bones from St. Helena Island. Smaller than Bulwer's Petrel; went extinct shortly after human settlement of St. Helena, likely from introduced predators. Part of the endemic St. Helena seabird community that was largely extirpated by human arrival.