However much you know giraffes, to see one in the wild for the first time feels prehistoric.

If we allow the destruction of the environment, we can see the terrorists have utterly won, and are destroying the future of our children and grandchildren. We must not let that happen.

There isn't a sharp line dividing humans from the rest of the animal kingdom. All the time, we find animals doing things that, in our arrogance, we thought were just human.

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.

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.

Lasting change is a series of compromises.

The person who has the most influence on me is my mother. Think of life as a flight where we fly higher and higher. If I were a bird that needs feathers to fly higher, I would regard my mother as my strongest feather.