Baluchitherium
Baluchitherium is an extinct rhinoceros from about 20-30 million years ago. It is believed to be the largest land mammal that ever lived. It stood 18 feet tall at the shoulder.

Eusthenopteron
A lobe-finned fish with lungs that lived 390 million years ago. It could cross-over the land if it's pond dryed up.

Diplocaulus
Its head grew increasingly flatter as it aged until it looked like an arrow. This animal used it's strange head as a sort of underwater wing.

Seymouria
This animal was a connecting link between reptiles and amphibians. Seymouria's skull was similar to an amphibian's. However most of the rest of its skeleton resembled that of a reptile.

Eryops
One of the first amphibians adapted for land.