This Frans de Waal would have to include in his book and his lectures, the end of those two sensible and defenseless beings he had been bringing up in his country- Holland, in that tenebrous center of reproduction, similar to the north American one- Yerkes- where he works, a place where many chimpanzees already had also cried, and he ignored. “I bought two male chimpanzees in a farm of reproduction in Holland. They had lived in separate cages, one close to the other for many months, until I used one of them as heart donor. When we sacrificed him in his cage in preparation for the surgery, the other one out incessantly. We did not find the fact significant, but this must have caused great trauma in his friend, therefore when we removed the body to the operation room, the other chimpanzee cried a lot and was very much sad per days. This incident touched me deeply. I swore to never again make experiments in such sensible creatures.” (Dr.Christian Barnard– responsible for the first heart transplant in human beings.)