Big headed German collapses and drowns

Living in a zoo environment is the only choice for many animals, polar bears are endangered, as are many other animals in zoos. Knut was born in captivity, you cant just release a bear born in captivity into the wilds, Knut's mother rejected him, so he had to be hand bred otherwise he would most likely have died. How possibly could this bear not have been kept in captivity? Knut clearly wasnt under chronic stress. Zoos in the developed world work around captive breeding programs with the aim of breeding endangered species, however some animals are in zoos because they had to be brought in to protect them from humans outside the zoo and sometimes other animals. Knut's mother was called Tosca, Tosca was a circus performer, now that is something animals rights groups should be putting energy into, circuses with animals is a bad plan. Humans are cruel animals, zoos which work ethically such as the ones run by the Royal Zoological Society work to protect species, ethical zoos protect and conserve, they hold animals that have been brought in because their lives were in danger, I've heard people say without thinking "That bear shouldnt be in a cage", they are in cages because their lives are in danger outside of the zoos. There's no way you can put a new born bear that has been rejected by its mother into "Its natural environment", it would be killed either by other bears or by humans, Knut had to be fed and kept warm and there was no mother to do this, since his keeper was so dedicated the bear could survive until this unfortunate moment. Aaron Sneddon