Parrots are among the smartest of birds. But are they clever enough to know each other by name? Research conducted by ornithologist Karl Berg suggests the answer might be yes. Berg’s studies of Green-rumped Parrotlets — such as the one pictured here — indicate that every parrot in a family flock has a distinct vocal signature learned from its parents. When others in the flock hear it, they know precisely who’s calling. Learn more at BirdNote.org.