A rat is one of the natures troops, it can be acquired only by following the quests and supplying the quest master with 200 crop; in which he then reinforces you with one. Unfortunately, the rat is not controllable but is permanently reinforced. The rat is the only nature troop type sent to us. You only get one rat, so if killed/starved, there is no opportunity for another one. Many of the top players find great joy in killing other players rats so to avoid letting them, the two options are starving the rat, or forfeiting doing quests. The rat's attributes are as follows:
Rat:
Attack: 10
Defence: 25/20
Upkeep: 1 crop per hour.