What is the smallest bird?

The smallest bird is the Cuban bee hummingbird. The bee hummingbird is scarcely larger than a bumblebee and weighs between .06 and .07 ounces, which is less than a U.S. penny.

The bee hummingbird is endemic to the dense forests of the main island of Cuba. Its length is 2 inches, including bill and tail, and is easily mistaken for a large bumblebee. Like all hummingbirds, it is a fast and agile flier and can hover in one spot while it feeds. It lives primarily on flower nectar though it occasionally eats an insect or a spider. The female builds a tiny nest of cobwebs, soft bark and lichen and lays two pea-sized eggs.