Long bone

A long bone is a non-tradeable bone dropped by monsters which drop big bones 100 percent of the time, such as hill, moss and fire giants, mogres, trolls, cave horrors, ogres, cyclopes, and suqahs.

Long bones may be sold to Barlak, a Dorgesh-Kaan cave goblin, for 1,000 coins each. Dorgesh-Kaan can be accessed after the quest Death to the Dorgeshuun. You will be given a lecture on Construction, granting 1,500 Construction experience (as long as your Construction level is at least 30). Long bones give 15 Prayer experience points when buried. However, given the ability to exchange these bones for coins and experience, this course of action is certainly NOT recommended.

If used in the Ectofunctus, you will receive the same experience as if you used big bones.

If you have reached a certain point in the Chosen Commander quest, Barlak will be too startled to talk about the bones.

Obtaining long bones
Although there are many monsters that drop this, it is fairly rare.

A good place to collect them is the Enchanted Valley. This requires the quest Fairy Tale II. Monsters such as river trolls and rock golems that have very low combat levels make collecting them quicker, plus they all drop big bones, adding Prayer experience.

After the update of the Impetuous Impulses activity on 22 February 2010, it is also possible to obtain long bones when looting Zombie impling jars.

List of monsters
Below is a list of monsters which drop long bones:
 * Aquanites
 * Cave horrors
 * Crocodiles
 * Cyclopes
 * Dagannoth guardian
 * Desert Lizards
 * Fire giants
 * General Graardor
 * Giant frogs
 * Giant Mole
 * Giant skeletons
 * Goraks
 * Hill giants
 * Ice giants
 * Icelords
 * Kree'arra (very rare)
 * Mogres
 * Moss giants
 * Mountain trolls
 * Tree spirit
 * Ogres
 * River troll
 * Rock Golems
 * Sea snake young
 * Sea trolls (from Swan Song)
 * Suqahs
 * Terror dogs
 * Tortoise
 * TokTz-Ket-Dill
 * Trolls
 * Yeti (including Nial Swiftfling in his Yeti form)
 * Warped tortoises