Study of birds is known as Ornithology.
Scientists believe that birds evolved from theropod dinosaurs.
The fastest running bird (97 kph) is the ostrich, but it cannot fly.
The Ostrich is the largest bird in the world. It also lays the largest eggs.
Hummingbirds can fly backwards.
The Bee Hummingbird is the smallest living bird in the world, with a length of just 5 cm (2 in).
A bird's heart beats 400 times per minute while resting and up to 1000 beats per minute while flying.