I think a major element of jetlag is psychological. Nobody ever tells me what time it is at home.

All our environmental problems become easier to solve with fewer people and harder - and ultimately impossible to solve - with ever more people.

I mean, it is an extraordinary thing that a large proportion of your country and my country, of the citizens, never see a wild creature from dawn 'til dusk, unless it's a pigeon, which isn't really wild, which might come and settle near them.

I'm not a propagandist, I'm not a polemicist; my primary interest is just looking at and trying to understand how animals work.

I would love to see a giant squid. Very few people have seen them. And only about half a dozen people have seen one alive.

I suspect that happiness is not a state but rather a transition.

If you watch animals objectively for any length of time, you're driven to the conclusion that their main aim in life is to pass on their genes to the next generation.