It was already dead

I have found and brought home a bone. A BIG bone. I've grossed mom out before by bringing home mice, rabbits, lizards and even this one time it was so cool, I found a deer leg that was still a leg and not a bone yet. So I don't know what this belong to but mom says it's a spine and I think it would only be gross if it was from a dog so I think it came from a different animal. The best part is that mom let me keep it and didn't take it away like the deer leg. It's not like I killed the deer myself, although I could tell people that and they might believe me and think I'm really a stud.