Well, Heini Hediger has had more or less two professions. On one side, he was an animal psychologist and probably his main achievement in this field was the distances, the biological distances. As individual distance, social distance, flight distance, and so on, he discovered these biological facts, which are very important for keeping animals as well. But he did a lot of other work, some very extraordinary work no other scientist ever tried to enter, like trimming in animals or the self-consciousness of animals and things like this, that nobody else tried to cover. And by the way, the distances, he discovered in a field that is not very well recognized among scientists. He discovered these distances in the circus. And he always has had a good relationship with circuses. The other part was being zoo biologist.
