A variety of the domestic pigeon, so called from the shape of the tail.

Any bird of the Australian genus Rhipidura, in which the tail is spread in the form of a fan during flight. They belong to the family of flycatchers.

the fantail goldfish.

The fantail is a popular breed of fancy pigeon. It is characterised by a fan-shaped tail composed of 30 to 40 feathers, abnormaly more than most members of the pigeon family, which usually have 12 to 14 feathers. The breed is thought to have originated in India, China or Spain.

A fantail is a standard "fancy" type of goldfish. It has a dual-lobed tail, unlike its cousin the common or comet. Its fins can be different sizes, ranging from just an inch or so up to 3 inches or more in length.