Dinosaur Bones

Little Man and I have a favorite book we like to read together called, "Dinosaurs Roar." In fact I've read it so much I practically have it memorized. The other day I asked him if he had any dinosaur bones, to which he said he did. When I asked him where he had them, he pointed to his bottom and said that was where he kept them. Who knew?!  I guess I missed that part when I was learning about the human anatomy.