tree creeper

from the GNU version of the Collaborative International Dictionary of English

• n. any one of numerous species of arboreal creepers belonging to Certhia, Climacteris, and allied genera. See Creeper, 3.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. any of various small insectivorous birds of the northern hemisphere that climb up a tree trunk supporting themselves on stiff tail feathers and their feet
• n. any of numerous South American and Central American birds with a curved bill and stiffened tail feathers that climb and feed like woodpeckers