Birds Commonly Seen on Sides of Trees Woodpeckers - Family Picidae
Acorn Woodpeckers have a distinctive appearance. The are famous for caching acorns in holes in trees.
The Red-bellied Woodpecker has been expanding its winter range northward. Sometimes confused with the Red-headed Woodpecker 
Populations of the Red-headed Woodpecker have fallen dramatically.
The Downy Woodpecker is our smallest woodpecker. It often appears at feeders. Compare with the very similar, but larger Hairy Woodpecker.  The Northern Flicker is easily identified in flight by its white rump. Creepers – Family Certhiidae
The Brown Creeper is often observed spiraling up the side of a tree. When it reaches a certain height, it will fly to the base of another tree and repeat its upward path. Nuthatches – Family Sittidae
The White-breasted Nuthatch is often observed walking down a tree trunk, in an upside-down posture. 
The Red-breasted Nuthatch is an irruptive species. Its winter range will expand and contract from year to year, based on available food supplies.
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