Birds tweet, squawk, chirp, hoot, cluck, and screech to communicate with each other. Some birds have found another way to talk, though: they make sounds by fluttering their feathers or smacking their wings together really fast. Scientists just discovered another species that makes sounds with its feathers, a bird from the American tropics called the Fork-tailed Flycatcher. And by analyzing recordings of the birds in flight, the researchers found that subspecies with different migration patterns have different "dialects" to their feather sounds, possibly helping contribute to them splitting into separate species.