I just wish the world was twice as big and half of it was still unexplored.

It's not just that we are dependent on the natural world for our food and for the very air we breathe-which is, of course, the case-and that the very richness of the natural world continues to provide us with all kinds of assistance.

Being in touch with the natural world is crucial.

The frontiers we broke into in the '60s are still largely unexplored.

An understanding of the natural world and what's in it is a source of not only a great curiosity but great fulfillment.

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