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Arman, however, wasn't so sure. ARMAN: Adaptation does not necessarily define diet. DANIEL: So he approached the question of ancient kangaroo extinction by taking a detailed look at the teeth of more ...

"Adaptation does not necessarily define diet," he says. He approached the question of ancient kangaroo extinction by taking a detailed look at the teeth of more than 900 kangaroos — a mix of ...

ARMAN: Adaptation does not necessarily define diet. DANIEL: So he approached the question of ancient kangaroo extinction by taking a detailed look at the teeth of more than 900 kangaroos ...

In a mass extinction event some 40,000 years ago, Australia lost 90% of its large species. New research suggests climate change played a much smaller role than once thought, though not all agree.