Take a Red Kangaroo, double its size, replace its paws with grappling hooks, give it bizarre feet each with a single hoof-like claw, then allow it to run at super-high speed face-first into a wall.

The largest species would be about twice as large as an adult male red kangaroo, which can reach up to 1.8m (5ft 10') tall. Unusually, although the three new species are all members of the same ...