Bone

Bones are items primarily obtained as drops from skeletons and fish mobs.

Mobs

 * Skeletons, wither skeletons, skeleton horses, and strays may drop 0–2 bones upon death.
 * All types of fish mobs will drop 0-1 bone upon death, except salmon, which can drop 0-3 bones upon death depending on the size of it.

Fishing
Bones can also be obtained by fishing as part of the junk category. The best chance of catching a bone is achieved without the Luck of the Sea enchantment, yielding a 1.1% chance.

Wolves
Using a bone on a wild wolf has a $1/3$ chance of taming it. Bones cannot tame an angry wolf or a wolf that has already been tamed.

Trivia

 * As with sticks and blaze rods, bones are wielded as a tool instead of an item.