These giant 'drop bears' with opposable thumbs once scaled trees in Australia. But how did they grow so huge?

Nimbadon lived 15 million years ago, in forests with flesh-eating kangaroos and tree-climbing crocodiles. Our first look inside their fossilised bones has revealed how these giants grew.

ZOONOOZ June 2013 by San Diego Zoo Wildlife Alliance - Issuu

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How It Works - Book of Dinosaurs, 4th Edition Pages 51-100 - Flip PDF Download

Brian Curtice, PhD on LinkedIn: #paleontologists #smilodon #paramylodon #fossilcrates #dinosaurtrips…

Giant tree-kangaroos once lived in unexpected places all over

Scientists discovered a 2,200-year-old condor poop…

Giant tree-kangaroos once lived in unexpected places all over

How Australia's drop bear came to be its most deadly -- and most

How Australia's drop bear came to be its most deadly -- and most fake -- predator, bear

How Australia's drop bear came to be its most deadly -- and most fake -- predator, bear