The Streamertail Hummingbird or 'Doctor' Bird, Trochilus polytmus is a long-tailed hummingbird.

They are the most abundant and widespread member of the family on the island of Jamaica, where the streamertail is also the national bird. Incidentally, the bird known to scientist as Trochilus polytmus, is the name-bearer of the whole hummingbird family, the Trochiliadae .

The next-to-outermost feather on each side of the male's tail is six or seven inches long, far longer than its bearer's back. Trailing behind the flying hummingbird like thin black streamers, these feathers make a humming sound.

These birds feed on nectar from flowers using a long extendable tongue or catch insects on the wing.

Because of their small size, they are vulnerable to insect-eating birds and animals. These birds require frequent feeding while active during the day and become torpid at night to conserve energy.