Marsupials

The Evolutionary Lessons of Marsupials
I'd wager that a marsupial mammal, given a lecture hall and a podium, could teach a fantastic course in evolution. Over millions of years, these amazing creatures have seen it all: divergent evolution, parallel evolution, and convergent evolution.

Koala (Phascolarctos cinereus)
Koala (Phascolarctos cinereus)