Alligator acoustics… Ever heard an alligator roar? Turn up that volume! American alligators make deep, booming sounds called bellows by inhaling air and forcefully expelling it. The result is a low, resonant rumble that can travel across the water. It’s part communication, part territorial display, and part swamp-based sound system. NPS Video: An American alligator floats with its head and tail above the water. It puffs up, then releases a deep, resonant roar that sends vibrations across the water’s surface. NPS/Federico Acevedo @evergladesnps