Winter must be on the wane, as a tufted titmouse was recently singing its fast-repeated, clear whistle song, “Peter—Peter—Peter,” in nearby woods. Male titmice repeat this phrase over and over, up to 11 times in succession. Occasionally females sing a softer version of this song. The calls of tufted titmice, on the other hand, are very nasal and mechanical-sounding. Songs are typically more musical and complex than calls, and are often sung only by males during the breeding season, to attract a mate and claim territory. Calls, on the other hand, have many purposes – there are calls for aggression, warning, identification, flocking, hunger and to announce a food source, among others.