When I was little, I had a book called Everyone Poops, by Taro Gomi. You know the one: captivating illustrations of deer pooping on the move. Babies pooping in their diapers. One-humped camels pooping one-humped poops. After all, everyone poops (although I do remember a curious lack of girls in that book — but we don’t do that sort of thing, do we? No, we emit rainbows or whatever.)