A big male gorilla likes to come roaring at you and take a big sweep of his arm and if he hits you with that big sweep, you'll probably feel it. (scientificamerican.com)
The brain is far larger than that of any ape, with the possible exception of extremely large male gorillas. (talkorigins.org)
Their findings showed that in male gorillas and orangutans, the need for larger chewing muscles alone could not explain crest formation. (newsweek.com)