any of a family (Paridae) of small passerine birds found throughout the world except in South America and Australia, including the tufted titmouse and various chickadees
See titmouse in American Heritage Dictionary 4
(tĭtˈmousˌ)
nounpl.tit·mice(-mīsˌ)
Any of numerous small insect-eating passerine birds of the family Paridae, found in woodland areas throughout the world and including especially members of the genus Parus, such as the chickadee. See Regional Note at tit1.