Rat

Rats are minor enemies, relatively harmless, and are found in many dungeons.

A Link to the Past
The lowest of creatures that inhabit the sewers and dark palaces of the land. Rats can be defeated by any means but are sometimes too fast to handle.

The Wind Waker
In The Wind Waker, the rats quite often live in small mouse-holes in the walls. Give them All-Purpose Bait, and they'll share some of their treasure with you; don't, and they'll ram into you, knocking several Rupees out for them to collect. While holding bombs, they're called Real Bombchus.

Twilight Princess
The rats found in Twilight Princess have a more feral look to them. There are three distinct variations found within the game. Standard rats are vile pests that can be found in caves or in the Arbiter's Grounds feeding off of skeletons. Undead rats known as Ghoul Rats are found in the later dungeons and can only be seen using Wolf Link's senses. There is also a Twilight version of the rat called Shadow Vermin, which have a somewhat squid-like appearance.

Phantom Hourglass
Rats in Phantom Hourglass, much like their The Wind Waker counterparts, use mouse-holes to hide in, only this time they will run in one hole and out another as opposed to using the same hole. Some rats hold Small Keys which must be taken from them in order to proceed through the game.