Leaping urchins are involved in a Prifddinas Waterfall Fishing random event. It consists of leaping urchins that players can try to catch. When the urchins appear, a player has to click it in time to catch it and get a certain amount of small, medium or large urchins. This will also yield 300 experience in Agility and Fishing.
The possible rewards for catching one are:
The total being equivalent to 100 crystal urchin points.
They leap up one to four times per location, frequently at multiple locations at a time. They can only be clicked once per leap; multiple clicks results in: "You have already caught this fish!" If more than one is present, they can be clicked by right clicking.