Yellowtail amberjack (Seriola lalandi).
A fish native to the northwest Pacific, often used in sushi, the Japanese amberjack (Seriola quinqueradiata).
Any of various fish with yellow tails, including:
A European moth (Euproctis similis)
The yellow-tailed black cockatoo (Calyptorhynchus funereus), a large cockatoo native to the south-east of Australia.
The yellow-tailed oriole (Icterus mesomelas), a passerine bird in the New World family Icteridae.
The yellow-tailed woolly monkey (Oreonax flavicauda), a New World primate endemic to Peru.
Having a yellow tail.