Prehistoric humans co-existed with giant wallabies

Forget your tired images of prehistoric humans riding atop woolly mammoths and replace them with the thought of people hopping about inside the pouch of a giant wallaby. New research suggests that early humans coexisted with Tasmania's megafauna — and might have had a hand in their extinction. » 5/28/12 2:00pm 5/28/12 2:00pm