Hummingbirds

Hummingbirds are the smallest birds in the world. Some are less than three inches long! They got their name from the sound that their wings make. Hummingbirds flap their wings as many as 80 times per second! This makes a humming sound. A hummingbird's wings let it fly in any direction. Hummingbirds can fly backwards. They can even fly upside down! These .....