It's easy to become hopeless. So people must have hope: the human brain, the resilience of nature, the energy of young people and the sort of inspiration that you see from so many hundreds of people who tackle tasks that are impossible and never give up and succeed.

Chimps taught us we're not separated from the animal kingdom, we're a part of it.

A chimp would never plan to pull another's nails out.

It made me feel particularly sickened to know that this kind of callous attitude toward animals is repeated again and again in laboratories around this country.

It was because the chimps are so eye-catching, so like us and teach us so much that my work was recognised worldwide.

The cheapest and most efficient way of slowing down global warming is to protect and restore the forests, particularly the tropical forests

I shouldn't have named the chimps. It wasn't scientific. I didn't know. I knew nothing. And worse sin of all was that I was ascribing to them emotions like happiness, sadness and so forth.