Who needs a calendar when you have white-winged doves?

I don't notice right away that they're gone. It usually takes a few days. Because there are so many mourning doves the absence of the white-winged doves (a.k.a. the Mafia birds) doesn't register right away.

Looking back on previous years, however, they always arrive in Tucson around April 15, and they leave around August 25. It's like they follow some universal travel schedule.