At the very least it is weird that the article says nothing about sexual selection, it is the go to hypothesis (that of course subsequently requires proof) for

At the very least it is weird that the article says nothing about sexual selection, it is the go to hypothesis (that of course subsequently requires proof) for weirdness. Like a peacock's super unhandy tail. Or the building of blue nests and performing weird dances in them by certain birds. If evolution lead to apparent wasting of energy, it is almost certainly sex related. But I guess it is a mystery of evolution to a dentist. Maybe said dentist (Martin Nweeia) should talk to an evolutionary biologist before appearing in blogs. It's also not like the Narwhal somehow decided to not have teeth, I guess if you swallow fish whole and everything is fine, a Narwhal without teeth has more energy left and less tooth related problems and thus better survival.