I can crush you with my butt
Wombats have an unusual defense system: a cartilage-padded rump. When a predator such as a dingo, Tasmanian devil or wild dog threatens them, wombats pull partway into their burrows, allowing the predator to get its head over the wombat’s back. Then the wombat uses its powerful legs to crush the predator’s skull against the top of the burrow.