The age of megafauna: Why did animals used to be so big?

The Science Briefing

Giant wombats and seven metre long lizards - not the stuff of nightmares, but real creatures that roamed Australia some 50,000 years ago.

They're called megafauna and the majority of these big animals and mammals went extinct, although we're not sure exactly why.

Dr Sophie Calabretto talks to Cosmos Magazine journalist Evrim Yazgin about the biggest and weirdest creatures that once walked the Earth, why they were so big and the theories around what wiped them out.

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