The World's Smallest Bird - Hummingbird

Hummingbird is the smallest migrating bird.

Hummingbird names comes from the humming noise their wings make as they beat so fast .

A hummingbird's brain makes up 4.2 percent of its weight proportionally , that's the largest of any bird's .

Hummingbirds have no sense of smell .

They have a good color vision .

These birds are the only birds that can fly backwards.

Hummingbirds can consume up to half or 1/8th of their body weight in a day .

Usually the eggs laid by female hummingbirds is two .