Primates are very territorial. It is in their nature to protect their food resources as well as their females and young.

Above all we must realize that each of us makes a difference with our life. Each of us impacts the world around us every single day. We have a choice to use the gift of our life to make the world a better place - or not to bother

I believe that the tragedy [like terror attack] that's caused so much grief and suffering to so many thousands and thousands of people has also served as a call to action, because many people now are re-examining their own value systems, and the churches, temples, mosques and cathedrals are packed to overflowing for the first time in years.

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.

At some point, my body will collapse. But I hope that my brain will still be working so that I can carry on with writing.

It would be absolutely useless for any of us to work to save wildlife without working to educate the next generation of conservationists.

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