Australia, 1967. Aborigines are finally recognized as persons and granted rights under the Constitution. Up until then, they were to be treated as 'native fauna' - i.e. animals.
http://www.creativespirits.info/aboriginalculture/history/ab...
http://www.creativespirits.info/aboriginalculture/history/ab...
I think the real problem isn't classifying animals - aborigines really do have a different genetic history from every other race. It's that we somehow equate "not properly human" with "deserves to be abused". Until we can escape from that mentality, we're really no better than these zoo keepers. We've just moved the threshold a bit.