Mob bones

Mob bones, they can be found at archaeological sites. They can be attached to a new bone stand (armor stand + sticks + iron). Let's say that you found the bones of a creeper, it will be 4 legs, 2 parts of the spine and a skull. Then you put the bones on the stand and you have a creeper skeleton, if you break the stand with a tool with a silk touch, then the stand and the bones will fall out in one item.