I have never witnessed it before, but I know everytime Greenbean gets any new toy mice with fake tails on them, within minutes she eats all of the tails. This is less true with the toy mice with the fuzzy tails, but they are known to have disappeared as well. I observed this behavior for the first time tonight. She grabs hold of her victim with her paws and chews through the side of her mouth as if on chewing gum until the tail is removed. As far as I can tell the rest is swallowed whole. My little Bean is insane.