Black-capped chickadee

The black-capped chickadee ("Poecile atricapillus") is a passerine songbird of the family Paridae. It lives in Canada, Alaska and the northern United States. This is a small, common bird which sings a simple song. 
Appearance.
The bird is about 12–15 cm (5–6 in) long and weighs 9-15 g (0.32-0.49 oz).
The male and female black-capped chickadees look the same. The black-capped chickadee has black and white on its head. The top of the head and throat are black, and the sides are white. It has a short, black beak.
The back of the bird is gray. The front of the body is white and light brown. The bird has short wings and a short tail.
Song.
The song of the black-capped chickadee is a clear whistle.
Behavior.
In the summer, the birds eat many insects. In the winter, they eat seeds and berries. They will hide seeds in different places and return later to eat
them. When two chickadees want to build a nest, they use a hole in a tree.