
Hippo
A floating boulder with kitchen-knife tusks.
Hippo vs Koala
Tonight's science rumble is set in the visitor lawn, now closed for SCIENCE. No snacks were harmed.
Hippo
Hippopotamus amphibius
Hippo sweat looks reddish. People called it blood-sweat. It is really a natural sunscreen.
Hippos graze grass at night. By day they soak and... argue.
Koala
Phascolarctos cinereus
A koala's fingerprint looks a lot like a human's. Weird science.
Almost only eucalyptus. Most of those leaves would upset other animals' stomachs.
Who do YOU think wins?

Koala
A sleepy specialist with surprising claws.