It coexisted when megafauna were still around so needed a severe effect to deter being eaten. That's the explanation our guide in the Daintree gave. 2 ton mars

It coexisted when megafauna were still around so needed a severe effect to deter being eaten. That's the explanation our guide in the Daintree gave. 2 ton marsupials, for example https://en.m.wikipedia.org/wiki/Australian_megafauna https://en.m.wikipedia.org/wiki/Australian_megafauna