I wasn't trying to be a scientist. I only ever wanted to be a naturalist, like a David Attenborough.

Chimps are unbelievably like us - in biological, non-verbal ways. They can be loving and compassionate and yet they have a dark side... 98 per cent of our DNA is the same. The difference is that we have developed language - we can teach about things that aren't there, plan for the future, discuss, share ideas

When you meet these outstanding leaders who have been through a programme that empowers them to take positive action, to make things better for people, for animals and for the environment - when you watch them interact and they start brainstorming, you realise you can relax, because they have got it right. They understand that there's more to this life than just money.

I think the most important thing to do is to be willing to listen, willing to care, and willing to admit mistakes and change your ways for the better!

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.

Whales, like elephants, are so social and intelligent. This hurts me to think of them being transported, put in noisy airplanes, and brought to a horrible concrete pen when they're supposed to be out in the sea.

Well, in some ways we're not successful at all. We're destroying our home. That's not a bit successful.