Halberstadt meets Dr. Vint Virga and explores the scientific research into the feelings of animals. “He has treated severely depressed snow leopards, brown bears with obsessive-compulsive disorder and phobic zebras. ‘Scientists often say that we don’t know what animals feel because they can’t speak to us and can’t report their inner states,’ Virga told me. ‘But the thing is, they are reporting their inner states. We’re just not listening.'”