Ainley's Storm-petrel vs Fork-tailed Storm-petrel
Hydrobates cheimomnestes compared with Hydrobates furcatus
Side-by-Side Comparison
| Attribute | Ainley's Storm-petrel | Fork-tailed Storm-petrel |
|---|---|---|
| Scientific Name | Hydrobates cheimomnestes | Hydrobates furcatus |
| Order | Procellariiformes | Procellariiformes |
| Family | Hydrobatidae | Hydrobatidae |
| Conservation Status | Vulnerable | Least Concern |
| Length | — | — |
| Wingspan | 30.1 cm (11.9 in) | 31.1 cm (12.2 in) |
| Weight | 41.15 g (1.45 oz) | 63.5 g (2.24 oz) |
| Diet | -- | -- |
| Clutch Size | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Vulnerable
Ainley's Storm-petrel
Least Concern
Fork-tailed Storm-petrel
About These Birds
Ainley's Storm-petrel
Ainley's Storm-petrel, 19–21 cm, is a recently described species breeding on the Channel Islands off California, present in winter — unusual among storm-petrels which typically breed in summer. Dark overall, white rump with central grey stripe. Vulnerable; small population and restricted range.
Fork-tailed Storm-petrel
Fork-tailed Storm-petrel, 20–23 cm, is a distinctive pale grey storm-petrel of the North Pacific, breeding on islands from California to Japan. Pale blue-grey body, dark wing tips, forked tail. Unlike most storm-petrels, feeds largely on fish and marine debris rather than zooplankton alone. Winters offshore.