There are certain things that are just impressive, aren't there? One stone can be impressive and the stones around it aren't. It's the same with animals. Some, for some reason, are strangely impressive. They just get into you in a strange way. Certain birds obviously have this extra quality that fascinates your attention. Obviously hawks have always done that for me, as a great many others have - not only impressive in themselves but also in that they've accumulated an enormous literature making them even more impressive. And crows too. Crows are the central bird in many mythologies. The crow is at every extreme, lives on every piece of land on earth, the most intelligent bird.