Skeletal monkey bones

Bones are dropped by the Skeletal gorillas in the Ape Atoll Dungeon. Unlike regular bones, if these are left on the ground for too long, another skeletal gorilla will emerge from them and begin attacking any nearby players. If there are too many skeletal gorillas already spawned, they instead turn into "burning bones", which cannot be picked up.

They can be buried like normal bones, providing the same amount of XP. Apon leaving the dungeon, they disintergrate.