One of the annoying cat creatures in the game. They dont damage you but they do steal your items if they hit you. If you beat them enough before they get away they'll give it back. IF they do get away, you wont be able to get the item back. You can still get it back though, if you go to their "junk" spot and search there.
In the Jungle, it's at the foot of the big tree in Area 2.
To prevent your useful items getting stolen, carry Felvine, they will steal that above anything else.