I'm not an animal lover if that means you think things are nice if you can pat them, but I am intoxicated by animals.

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.

We keep putting on programmes about famine in Ethiopia; that’s what’s happening. Too many people there. They can’t support themselves — and it’s not an inhuman thing to say. It’s the case. Until humanity manages to sort itself out and get a coordinated view about the planet it’s going to get worse and worse.

Natural history is not about producing fables.

It never really occurred to me to believe in God.

I'm a humanist. I'm neither one side nor the other.

Crying wolf is a real danger.