Reite and his colleagues experimented on chimpanzees because relatively little experimental work had been done on the great apes, as compared with monkeys. They apparently felt no need to address the basic question of why we should be doing any experiments on maternal deprivation in animals at all. They did not even try to justify their experiments by claiming they were of benefit to human beings. That we already have extensive observations of orphaned chimpanzees in the wild seems not to have been of interest to them. Their attitude was plain: this has been done with animals of one species, but not with animals of another, so let's do it to them. The most amazing part of the story is that taxpayers have paid for all this research, to the tune of over $58 million for maternal deprivation research alone.