swallowtail

Etymology

swallow + tail

noun

1. The forked tail of a swallow.
2. Anything, such as a burgee, of a similar forked shape.
3. A type of tailcoat with two long tapering tails.
4. Any of various butterflies of the family Papilionidae, many of which have a long extension to each hindwing.
   Claudette visit me […] and the biggest, most beautiful black-and-yellow Jamaican swallowtail butterfly follow behind she, like it give us it little blessing. 2020, Paul Mendez, Rainbow Milk, Dialogue Books (2021), page 8