Rat's tail

A Rat's tail is a quest item used in the Witch's Potion quest. It can be obtained by killing any rat in RuneScape after the player has begun Witch's Potion. The item has a 100% chance to drop once you begin the quest.

Brian's Archery Supplies, a store that sells Ranged supplies has a couple of rats which are very convenient for the player, since the store is located near Hetty the Witch's house.

Contrary to popular belief, Giant rats do drop rat tails.

After completion of the quest, the Rat's tail is unobtainable through killing rats. If the player shows a Rat's Tail to the Wise Old Man, he will tell the player to get rid of it.