Dominant Species 2nd Edition

Dominant Species is a game that abstractly recreates a tiny portion of ancient history: the ponderous encroachment of an ice age and what that entails for the living creatures trying to adapt to the slowly-changing earth.
Each player will assume the role of one of six major animal classes—mammal, reptile, bird, amphibian, arachnid, or insect. Each begins the game more or less in a state of natural balance in relation to one another. But that won’t last: It is indeed "survival of the fittest".