But of course, these enclosures were rather like concrete enclosures so it was mainly more for the visitor than for the animals, these moated enclosures. The second milestone was achieved in the ’30s of last century in St. Louis Zoo, when the first open-fronted aviary was created. And that’s psychologically a very interesting invention. To give the animal, the birds in this case, a habitat in which they feel happy. And the visitor is not through barriers or glass separated but just though a space that is totally empty, where the birds do not feel happy. And so you see the birds directly without any separation. I think that was the second step. The third step was the start of the regional breeding programs, of which we already talked.
