Reddit reviews Evolution

That isn't how this works. Those tusks won't grow long enough to pierce its skull until well after it has reproduced. Since long tusks actually attract mates (as they good for defense) there's no real evidence to suggest nature is selecting against these. Not to mention they often curve away and pass by the ears. This specific case was covered in this book.

What some people need to realize is the standard isn't perfection and self-killing tusks aren't going to be selected for or against if they have no bearing on reproduction. These "flawed" genes can healthily propagate when they don't influence their own passing on.

The book is called "Evolution" and it's by Jean-Baptiste de Panafieu.

I picked up a copy of Evolution on a whim and have really enjoyed reading it. It's classified as a textbook, but it really reads more like a layman's science magazine, with short 2-5 page chapters that cover a certain concept, accompanied by beautiful grayscale pictures of various skeletons.