We reckon that in about 20 years there'll be none left.

Change happens by listening and then starting a dialogue with the people who are doing something you don't believe is right.

I'm always pushing for human responsibility. Given that chimpanzees and many other animals are sentient and sapient, then we should treat them with respect.

I learned from my dog long before I went to Gombe that we weren't the only beings with personalities. What the chimps did was help me to persuade others.

When I look back over my life it's almost as if there was a plan laid out for me - from the little girl who was so passionate about animals who longed to go to Africa and whose family couldn't afford to put her through college. Everyone laughed at my dreams. I was supposed to be a secretary in Bournemouth.

When I was two, a dragonfly flew near me. A man knocked it to the ground and trod on it. I remember crying because I'd caused the dragonfly to be killed.