Speaking of the brutal side of chimps -- don't know how widely this story was carried nationwide but a man here in Cal. was severely, and I mean severely, mauled by two male chimps at a sanctuary last March. He and his wife were visiting a chimp they had raised from a baby and kept for about 25 years before the state made them send him to the sanctuary after it had bitten a female deputy's finger off.
The two males involved had managed to escape and apparently were jealous of the birthday cake the couple had brought for their chimp.
I've read that chimps are an estimated 3 to 4 times stronger than humans (!?!) in upper body strength, and this at a weight of 140 lbs.
I guess the ones that look so cute in movies are still babies or close to it. Moral of this tale: steer clear of adult chimps.
http://www.cbsnews.com/stories/2005/03/04/national/main678061.shtml