Bluebirds have their own language which consists not only of songs and calls but also wing-waves. According to Donald and Lillian Stokes, authors of The Bluebird Book, “It is done . . . as a kind of greeting or attention-getter. The male does it at the nest entrance and on top of the box and sometimes when he has food for the female. Both birds do wing-wave as the other flies overhead or near. And wing-wave is often given when the two land near each other on a perch or at the nest box.”
This male Eastern bluebird is doing the characteristic wing-wave as he lands near the nest box.