fork-tailed petrel
noun
variants:
or less commonly forked-tailed petrel \ ˈ⸗ˌ⸗- \
Definition of fork-tailed petrel
: a bluish gray white-marked petrel (Oceanodroma furcata) that has a deeply forked tail and is widely distributed in the northern Pacific
also
: any of several closely related birds with more or less forked tails