Great Shearwater vs Small Saint Helena Petrel
Ardenna gravis 对比 Bulweria bifax
Side-by-Side Comparison
| 属性 | Great Shearwater | Small Saint Helena Petrel |
|---|---|---|
| 学名 | Ardenna gravis | Bulweria bifax |
| 目 | Procellariiformes | Procellariiformes |
| 科 | Procellariidae | Procellariidae |
| 保护状况 | Least Concern | Extinct |
| 体长 | — | — |
| 翼展 | 63.6 cm (25.0 in) | — |
| 体重 | 832.5 g (29.37 oz) | 167.17 g (5.90 oz) |
| 食性 | -- | -- |
| 产卵数 | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
保护状况
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.