Downy Woodpecker

Smaller than the Hairy Woodpecker.
"Downy Woodpeckers are small versions of the classic woodpecker body plan. They have a straight, chisel-like bill, blocky head, wide shoulders, and straight-backed posture as they lean away from tree limbs and onto their tail feathers. The bill tends to look smaller for the bird’s size than in other woodpeckers.

Color Pattern. Downy Woodpeckers give a checkered black-and-white impression. The black upperparts are checked with white on the wings, the head is boldly striped, and the back has a broad white stripe down the center. Males have a small red patch on the back of the head. The outer tail feathers are typically white with a few black spots."CornelWeb Ornithology