From Today's New York Times

Animal Ethics

27): It’s little wonder that Tatiana, the tiger that escaped from the San Francisco Zoo, longed for her freedom. An Oxford University study published in the journal Nature found that wide-ranging carnivores like tigers and other big cats “show the most evidence of stress and/or psychological dysfunction in captivity.” 28, 2007 The writer, on the staff of the People for the Ethical Treatment of Animals, writes for its Animals in Entertainment Campaign