From Minecraft Wiki
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Bones are items.
 From world generation
 From mobs
 From fishing
 As a crafting ingredient
|1.2||Added bones, which can be crafted into Bone Meal.|
|1.4||Bones can now be used to tame Wolves.|
|1.3.1||12w21a||Bones can now be found within Desert Temples, allowing bones to be obtainable on peaceful mode.|
|1.4.2||12w36a||The newly introduced mob, the Wither Skeleton, also drops bones.|
|1.7||13w36a||Bones can be more easily obtained in peaceful mode by fishing this as a "junk" item.|
|Pocket Edition Alpha|
|?||Added bones to survival mode.|
|0.9.0||build 1||Added bones to creative mode.|
- As with Sticks and Blaze Rods, Bones are wielded as a tool instead of an item.
- The bone appears to be the femur, the humerus, or the tibia of a human, however is more likely to be the femur, because the humerus and tibia are slightly curved.