Why weren there any two-legged mammals on Gondwanaland?
Man is the only animal we know of that habitually moves around on two legs (although some other apes can walk on two legs for short times), kangaroos and wallabies are bipedal for some movement, and quadrupedal while feeding. It appears that humans and their ancestors didn’t evolve until about 3-4 million years ago, and this was well after the break-up of Gondwana occurred. Kangaroos and wallabies don’t appear in the fossil record until after the separation as well.
