Bone

Bones are items primarily obtained as drops from skeletons and their variants.

Mobs
Skeletons, wither skeletons, skeleton horses, and strays may drop 0–2 bones upon death. The maximum drop is increased by 1 per level of Looting, for a maximum of 0-5 bones with Looting III.

$$, salmon(large size), cod, pufferfish, and tropical fish have 25% chance to drop 1-2 bones upon death, The maximum drop is increased by 1 to 2 per level of Looting, for a maximum of 2-8 bones with Looting III. Salmon (small and medium size) have 25% chance to drop 1 bone upon death, The maximum drop is increased by 1 to 2 per level of Looting, for a maximum of 2-7 bones with Looting III. The chance of dropping bones increased by 1% per looting level, so up to 28% chance with Looting III

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.

Helmet
While a bone cannot be equipped in the head slot in Survival mode, equipping it using commands will cause it to appear in the player's mouth.

Wolves
Using a bone on a wild wolf has a $1/3$ chance of taming it. Bones cannot tame a hostile wolf or a wolf that has already been tamed. However, bones can be used to attract the attention of the tamed ones.

Trivia

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