Brown creepers are starting to show up, but not in big numbers. I saw only one this morning along with its tree hugger cousin the nuthatch. I guess the sapsuckers are part of that club too.

Brown Creeper

White-breasted nuthatch

Yellow-bellied sapsucker ... note how well its back blends in with the tree's bark. The greenish-yellow on the woodpecker even matches the growth of mossy patches on the bark. Astonishingly well-suited in its camo cloak.