Firstly, I quite agree that all species, great and small should be conserved in a good zoo, if they are endangered in the wild, if this could be possible, if the zoos had bottomless pits of money to build these enclosures on hundreds of acres at their disposal, unfortunately as we all know this is not the case, the zoos have to raise funds by attracting visitors, and like it or not, it is the charismatic animals that draw in the crowds. Also, I feel that the good zoos are, at times, in a no win situation, gorillas at London for example. When they lived in the Sobell Pavilion certain interest groups described their living conditions as "dire", I agree that they were certainly not perfect, however I remember what a great improvement they were on the old monkey house where they had lived previously. Due to the generous legacy of zoo volunteer, Delaine Welch, London have been able to build Gorilla Kingdom, at a cost of millions. You would then think that the people who had described the Sobell Pavilion as dire would then be pleased, this was not the case, they then state that this money would have been better spent on gorilla conservation in the wild, not just to rehouse three "dis functional" gorillas in the zoo. Well yes, it is preferable for gorillas to live wild in Africa rather than in a corner of Regent's Park, however let us live in real world here, I understand that if you know where to go, you can have gorilla meat served to you in a restaurant in London today, as far as I am aware gorillas are not "farmed " anywhere that I know of, unlike ostrich and deer, so I think it is correct in stating that this gorilla meat must have been obtained by killing wild gorillas, that is the reality of the matter,and unfortunately not only for gorillas, but many other endangered species, including the smaller, not so well known species that you mention.