>I've found that ferrets have at least 2 different types of hissing that >they do. When they are angry, it's a steady SSSSSSSSSSSSSSSSSSSSS >sound. Sounds like a leaky tire or something. One of our previous >ferrets, Pooh, also had a hiss that sounded like hhhh hhhh hhhh hhhh. >It came in little short bursts and sort of sounded like panting. He >did that when he was happy. The first is a hiss The second is laughter, not a hiss. Both are very ancient animal sounds, just as purring and growling are. [Posted in FML issue 5152]