>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]