If you catch somebody doing something wrong, he will just cringe away and curl up. He will not listen anymore. Instead, he will think of how he can counterattack.

Here we are, arguably the most intelligent being that's ever walked planet Earth, with this extraordinary brain ... and yet we're destroying the only home we have.

The only possible way to get somebody to change is to reach into their hearts.

It was both fascinating and appalling to learn that chimpanzees were capable of hostile and territorial behavior that was not unlike certain forms of primitive human warfare.

If we kill off the wild, then we are killing a part of our souls.

We are unique. Chimpanzees are unique. Dogs are unique. But we humans are just not as different as we used to think.

I've always felt you don't have to be completely detached, emotionally uninvolved to make precise observations. There's nothing wrong with feeling great empathy for your subjects.