It's wild that the Koala's biggest predator is Chlamydia

You’ve just mentioned one of the things that has annoyed me for many years.

The koala’s diet is mostly Eucalyptus, quite toxic. So they sleep for 20 hours a day, and are slow. This didn’t make sense to me because it would be a sitting target for predators.

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Working on building zkTLS infra/products. A ruthless empiricist.

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There are barely predators in Australia.
Apart from the Crocs, there's dingos, which aren't naturally occurring there. 
That's pretty much it.