I guess I left the mouse under the heat lamp a little too long. The skin broke a little as I picked it up, but I didn't think much of it... Then a lot more skin broke when Hoosac wrapped it. He also struck from a sort of awkward cranny, so he hit the wrong end and then smeared it around some more trying to unwrap it. He's now on his third vigorous try at swallowing it from the wrong end The first try involved trying to work the tail down tip first. But of course it's too skinny for him to walk his jaws on, so that effort was eventually abandoned, at which point he was almost completely upside down. The mouse has aspen stuck all over it, and looks almost broken in half, and who knows what mouse innards are smeared all over Hoosac and his hide and everything else.
Oy, what a mess! And now I'll have to bother him while he's digesting to clean it up.