yellowtail.

Having a yellow tail.

Any of various fish with yellow tails, including: yellowtail amberjack (Seriola lalandi).

Any of various fish with yellow tails, including: Japanese amberjack (Seriola quinqueradiata), native to the northwest Pacific, often used in sushi, .

Any of various fish with yellow tails, including: Atlantic bumper (Chloroscombrus chrysurus).

Any of various fish with yellow tails, including: yellowtail flounder (Limanda ferruginea).

Any of various fish with yellow tails, including: yellowtail snapper (Ocyurus chrysurus).

Any of various fish with yellow tails, including: whitespotted devil (Plectroglyphidodon lacrymatus).

Any of various fish with yellow tails, including: yellowtail horse mackerel (Trachurus novaezelandiae).

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.