|An arm bone. All arm bones are identical.|
The arm bone is an item that can be dropped by many prehistoric creatures upon death or by mining fossil blocks. There is an individual arm bone item for each creature that drops it, but the item texture is always the same.
7.2 UPDATE Edit
Mammals, birds, coelacanths, and nautilus do not drop arm bones. The arm bone has no use in this update; they cannot be used in any crafting recipes, cannot create bonemeal, and cannot be analyzed to produce DNA.