Rat (Oblivion)

Rats are common throughout most of the Elder Scrolls series. Most Fighters Guild quests start off with a quest involving a rat of some sort.

Description (From Morrowind): 

"The Cave Rat is a subterranean variety of the hardy, abundant hunter-scavenger. Rat meat is tough and greasy, with an unpleasant odor and taste. Nonetheless, it is cheap, abundant, and nutritious, and palatable when cooked in a stew and masked by strong, strong spices"