I think Heger is still very well known in Germany, Switzerland, Austria, of course, he had been the director of three zoos, one after the other burned Basel village. And he laid the foundation of the modern scientific led zoo in his books. He wrote the first one in 42. The second one was published I think in 65. And I read it and I was so engaged and enthusiastic about this book that I always wanted to work in the zoo. And that book would be man and animal Yes. In the zoo. Right. And it was an important volume to you. Yes. And I think for more many zoo people at that time.
