Rat - The RuneScape Wiki

Rats are small animals which can be found in numerous locations, mostly in cities, sewers and dungeons. They are best found outside and on the ground floor[UK]1st floor[US] of Lumbridge Castle. Their tails are most commonly used for the completion of the Witch's Potion miniquest, and they are one of the weakest creatures in RuneScape. The only rats that drop bones are those in the Stronghold of Security. They are good for training on for new players as they have low life points and defence and respawn in only a few seconds, but they can be hard to click as they're small and move very fast.

Ardougne Sewer, Old School RuneScape Wiki

Giant rat bone - The RuneScape Wiki

Rat (2008 Easter event) - The RuneScape Wiki

Squirrel (NPC), RuneScape Wiki

Rat pole - The RuneScape Wiki

Squirrel, Old School RuneScape Wiki

Samuel LeBaux, RuneScape Wiki

RuneScape Bestiary - The RuneScape Wiki

Dungeon rat - OSRS Wiki

Cave mouse - The RuneScape Wiki

Hell-Rat - OSRS Wiki

Giant sea rat - The RuneScape Wiki