Bone

A bone is an item dropped by skeletons and Wither Skeletons upon death. The amount of bones dropped varies from 0-2 bones.

Uses
Bones can be used to tame wild Wolves. Giving a bone to a wolf does not guarantee it will be tamed; because of this, multiple bones are sometimes required. Note: It is impossible to tame aggressive wolves.

Bones can be used to make Bone Meal, which serve two main purposes:
 * As a fertilizer, which grows many plants to their fully mature state
 * As a crafting ingredient in Wool Dyes

As a crafting material
Bone creates 3 Bone Meal when put in the crafting table. This can be used for dyes and growing most plants instantly.

Trivia

 * As with Sticks, Bones are wielded as a tool instead of an item. However this does not apply to Blaze Rods.