tit·mouse 
(tĭtmous′)
(tĭtmous′)n. pl. tit·mice (-mīs′)
Any of several small insectivorous songbirds of the family Paridae of woodland areas, especially members of the genus Baeolophus, such as the tufted titmouse.
[Alteration (influenced by mous, mouse) of Middle English titmose : tit- (probably from Old Norse tittr, small peak, pin, titmouse) + mose, titmouse (from Old English māse).]