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The giant diprotodon appeared in Australia more than 1.5 million years ago and successfully weathered at least ten previous ice ages.

But more than 90 per cent of Australia’s megafauna disappeared along with the diprotodon.

Consequently, if humans cut down even one diprotodon every few months, it would be enough to cause diprotodon deaths to outnumber births.

Within a few thousand years the last, lonesome diprotodon would pass away, and with her the entire species.

So when a diprotodon, the largest marsupial ever to walk the earth, set eyes for the first time on this frail-looking ape, he probably gave it one glance and then went back to chewing leaves.