Rat

Rats are small animals which can basically be found anywhere. Level one rats do not appear on the minimap.

Fighting strategy
Players can fight rats in any way they want. Players do not need to wear armour against them as they very rarely hit. During the Witch's Potion quest they also drop a rat's tail. These are popular training monsters for new players, as they are very common and don't hit hard.

Cats
If you have a cat or a kitten you can tell it to chase vermin, in which it will try to attack any rat in range.