Birds are warm-blooded creatures, covered in feathers, with a special tooth, for breaking open the egg shell, and a light skeleton.

Feathers
A bird’s feathers can be about any color! Feathers are like a warm, fuzzy coat for the cold and they also might pluck their feathers out if they are stressed or they are shedding their feathers.
Beak
Their beak are for pulling out worms, getting twigs for a nest, and more. Usual birds should have their beak near their eye.
Wings
Wings, of course, are for flying and they sometimes fake their wing is broken to lead enemies from their nest because the enemies will think they are easy to catch.
Claws
Birds use them to hang onto branches.
Diet
Some things they eat are earthworms, flies and fish.

Mating
Birds normally have something different tricks for finding a mate such as dancing.