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.

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

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Why have bears evolved to eat a lot of small animals for prey, whereas other predators (for example, big cats, and crocodiles) have evolve to eat big animals? Which is more beneficial?

Wandering & Wondering in New Mexico: 2016