Donny Bajohr At first glance, the two gorilla skulls on display in a new exhibition at the Smithsonian’s National Museum of Natural History are unremarkable, except for maybe their size.

Punching the gorilla wouldn't do much damage because the ape's skin and skull are thicker than any human's. And if a gorilla decides to bite you in a fight, I hope you have life insurance.

Kitoko sustained a fractured skull and a severe laceration. Zoo officials say the 2-month-old gorilla underwent surgery and may fully recover if he doesn't develop an infection. "We are cautiously ...