Curious about animals that hiss? From reptiles to birds, mammals to insects, hissing is a fascinating behavior in the animal kingdom. Picture yourself encountering an African Rock Python, coiled and ready to strike, emitting a powerful hiss. Or imagine coming face to face with an Alligator, its jaws wide open, hissing fiercely to intimidate. Even birds like African Geese and Black Swans can make loud hissing sounds when alarmed.