RuneScape/Bones

Almost every creature you would expect to have a skeleton usually drops bones. You can pick them up and bury them by clicking on them to gain 4 experience for your Prayer skill.

People who are not developing their Prayer skill will often leave bones behind, so be sure to pick them up and bury them whenever you see them.

Bones

 * Price: 10-50gp

Encounters that drop these

 * Chicken
 * Giant rat
 * Goblin

Monkey bones

 * Price: 10-50gp

Burnt bones

 * Price: 10-50gp

Big bones

 * Price: 150-450gp

Dragon bones
Dragon bones are a members only item.
 * Price: 1600-25000gp