Old English creopera "one who creeps," agent noun from creep (v.). Also see creep (n.). Meaning "lice" is from 1570s; of certain birds from 1660s; of certain plants from 1620s.
any of various small birds that hug tree trunks or rock surfaces as they move about while feeding. The following are songbirds (suborder Passeres; order Passeriformes):