The quillback (Carpiodes cyprinus).
The basking shark (Cetorhinus maximus).
A fish of the genus Istiophorus, having a characteristic sail-like fin on its back.
Any of various butterflies of the family Papilionidae, many of which have a long extension to each hindwing.
A type of tailcoat with two long tapering tails.ᵂᵖ
The forked tail of a swallow.
Anything, such as a burgee, of a similar forked shape.