Here’s the answer:

Why would a chimpanzee attack a human?

What we learn here is that, even though chimps are a lot like humans, there are some major differences. For example:

The chimpanzee has strength for a human that is utterly incomprehensible. People watch pro wrestlers on TV and think they are strong. But a pro wrestler would not be able to hold a chimpanzee still if they wanted to. Chimpanzee males have been measured as having five times the arm strength as a human male. Even a young chimpanzee of four or five years, you could not hold it still if you wanted to. Pound-for-pound, their muscles are much stronger. And the adult males, like Travis—unless his were filed down—have big canine teeth. So you have a very dangerous creature in front of you that is impossible to control.

Some of the similarities and differences are more subtle:

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