The distinctive whistled song was famously rendered quick, three beers! by early field guide authors. Males give this song throughout the breeding season but most consistently and frequently early in the season. Some apparently unmated males give variations on the song, and females also sing occasionally when nesting commences, though their song is not as loud or ringing as the male’s. Even fledglings sing weakly at times.
The most frequently heard call is a sharp pip, usually given three times in quick succession but sometimes 2 or 4 times or in very rapid staccato series or even a twitter, given by both sexes. Males involved in clashes with other males utter growling or gurgling sounds or squeaks.
A loud snap of the bill is often heard when foraging birds capture an insect; it is also used in pair-bonding.