adjective
(in the names of certain organisms) Having a yellow tail.
noun
Any of various fish with yellow tails, including:
A European moth (Euproctis similis)
A yellow-tailed black cockatoo (Calyptorhynchus funereus), a large cockatoo native to the south-east of Australia.
A yellow-tailed oriole (Icterus mesomelas), a passerine bird in the New World family Icteridae.
A yellow-tailed woolly monkey (Oreonax flavicauda), a New World primate endemic to Peru.