Key Identification Features
- The main distinguishing feature of fork-tailed storm petrels is their overall bluish-gray plumage.
- This species is a very distinctive member of the storm petrel family, with a dark cap, white face and underparts, a forked tail, and a black band across the chest.
- However, separating it from band-rumped storm petrels is difficult, and identification relies on features such as the extent of white on the rump and flight pattern.
- The Mediterranean subspecies averages longer wings and a heavier bill than the nominate form, but neither sex nor subspecies can be identified by observing the bird at sea.
For instant identification in the field, use the iNature app — AI-powered, works offline.
