Why does Australia have the best and most diverse wildlife?

Kangaroos, koalas, wombats, wallabies, echidnas, platypuses, wallaroos,Tasmanian devils, quokka, quolls, possums, numbats, bilbies, potoroos, pademelons, the list goes on... Also the infinite number of bird species, snakes etc... What is it about the Australian climate and environment, and other factors, that gives it such a diverse array of wildlife and unique ones at that.
Answers

ꀘꍟꍟᖘꀤꈤꁅ ꀤ꓄ ꍏ꒒ꀤᐯꍟ ❤️

Probably its isolation from the rest of the world for so long, and its careful management of the enviroment by its aboriginal peoples.

Bob the Heathen Serb

I wouldn't say the best but few as a rarest. What's in Australia is barely find in elsewhere. Compare to the world we have the most venomous creatures and yet we live along them in peace. No harm done.

snafu

“Best” wildlife...what is this, a game of Top Trumps? Your koala v my sparrow?

L.N.

Australia's diversity is a result of its isolation and relative lack of major predators before the arrival of men. The native wildlife other than kangaroos was no match for dingos, rats, cats, rabbits and toads.

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Isaac Hunt

Australia has a particularly noxious local version of the bludger. It frequents Centrelinks and RSLs where it lies about it's exploits. It can be identified by it's yellow belly.