What am I looking at?
One is a wolf the other is a Tasmanian wolf, aka Tasmanian tiger.
What is interesting about it?
A wolf is a placental mammal like us. The Tasmanian wolf is a marsupial, with an external pouch. (Think Kangaroo).Which means that although they look similar, and are top predators in their respective food chains, they are very very distantly related. Placental mammals and marsupials diverged almost 50 million years ago. Similar characteristics and body structure of the two creatures evolved independently. This is a phenomenon is biology known as convergent evolution.
The Tasmanian wolf thrived on the Australian mainland and Tasmania. The Tasmanian wolf, like the Dodo is now extinct.