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Even when behaviors are clearly stress-related, they can be difficult to interpret. Mel Richardson was once asked to examine a tree kangaroo at the San Antonio Zoo that the keepers said was acting bizarrely. With the ears of a teddy bear, the rounded chub of a koala, and the tail of a fuzzy monkey, tree kangaroos are very cute. But this female was acting vicious. She was attacking her babies, and the keepers had no idea why. Mel went to check on her. Sure enough, as soon as he approached, the kangaroo ran to her babies and started hitting and clawing at them with her paws. He stepped back, and she stopped. He walked forward, and she ran at the babies again. “I realized,” said Mel, “that she wasn’t viciously attacking her babies at all. She was trying to pick them up off the floor, but her little paws weren’t meant for that. In her native Australia and Papua New Guinea her babies never would have been on the ground. Her whole family would have been up in the trees.” The mother kangaroo wanted to move the babies away from the humans. What looked like abnormal attacks on her young were actually her way of trying to protect them. Her behavior wasn’t mental illness at all but a response to the stress of being a mother in an unnatural environment. After the keepers redesigned the kangaroos’ cage so that more of it was elevated and farther from the door, she relaxed and stopped hitting her babies. Mel explained, “As flippant as it might sound, the truth is that in order to know what’s abnormal, you must first know what’s normal. In this case in order to determine pathology, I had to understand the animal’s psychology. It’s pretty easy for people to get this wrong.
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Laurel Braitman (Animal Madness: How Anxious Dogs, Compulsive Parrots, and Elephants in Recovery Help Us Understand Ourselves)