The family Certhiidae includes 1 species found in North America.
Small; brownish above streaked and spotted with white and buff; whitish below; rectrices stiffened; bill thin, decurved, pointed. Forage for insects, their eggs and larvae, moving only upward on tree trunks and limbs, using the tail as a prop. Nest of moss, bark strips, grass, twigs, placed behind a piece of loose bark, usually of a dead tree. Both sexes build the nest. Eggs 6-9, white with reddish spots.
Creepers - Patuxent Bird ID Center