Wombat are extremely powerful. They are expert diggers. They have extremely hard butts and if any predators follow down into their holes, the wombat can kick upwards, crushing their pursuer's skull against the roof.
Despite their little legs, they can run in a straight line up to 40km/h. That puddle ain't shit.
If you hit a roo with your car, the roo bounces off. If you hit a wombat with your tire, it can break the axle and put your car out of commission.
Wombats are the tanks of the marsupial world. Don't fuck with a wombat.