Tokyo Jungle. The animals inherit the Earth with this post-apocalyptic game.

Tokyo Jungle is a game being developed for PlayStation 3 and is set in a post-apocalyptic Japan, where the human race is almost extinct and animals have reclaimed the planet.

The game has 2 modes.
Story mode - you play through missions that follow a storyline

Survival mode - the player chooses from at least 80 animal selections (elephants, crocodiles, cheetahs, porcupines, chickens, ostriches, dogs, etc.)  and try to surive as long as you can.

The basic story is a post-apocalypic Japan where humans are pretty much all gone leaving the animals to fend for themselves.

Pretty interesting take on the post-apocalypic genre.
The game is set for a winter release.