tree creeper

noun

1. 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

   noun.animal

   Synonyms creeper

   Source: WordNet 3.0

2. any of numerous South American and Central American birds with a curved bill and stiffened tail feathers that climb and feed like woodpeckers

   noun.animal

   Synonyms wood-creeper woodcreeper woodhewer

   Source: WordNet 3.0