The Kangaroo Claw

This is a photo of a back paw of a kangaroo (via):

Consider that kangaroos' back legs are unbelievably powerful—they can jump an eight-foot fence from a standstill, and can leap nearly thirty feet while running—and that they can stand over eight feet tall while in fighting position. That claw could rip your guts out.

Now here's a video of a kangaroo attack.