"You might think that a hornbill would have the most powerful excavation tool of all, but in fact its huge beak is a r…"

"I don't know [why we're here]. People sometimes say to me, "Why don't you admit that the hummingbird, the butterfly, …"

"I often get letters, quite frequently, from people who say how they like the programmes a lot, but I never give credi…"

"If we [humans] disappeared overnight, the world would probably be better off [making the point that the reverse is no…"

"People who accuse us of putting in too much violence, [should see] what we leave on the cutting-room floor. My consci…"

"In moments of great grief, that's where you look and immerse yourself. You realise you are not immortal, you are not …"

"I don't think any human society is prepared to make decisions which they may not like if they're made by people who d…"

"We must change our diet. The planet can’t support billions of meat-eaters."

"We are going to have to live more economically than we do. And we can do that and, I believe we will do it more happi…"

"Mallards must be one of the most familiar birds in the world. Because of that, perhaps we tend to take ducks for gran…"