• Kieran Dodas/Rex USA
    3 of 13

    CABIN FEVER

    Animal: Chimpanzee

    Diagnosis: Situational Anxiety 

    Doctor's Notes: Scientists were not surprised to find that lab monkeys developed abnormal behaviors, but didn't expect the same reactions in zoo chimps. New research shows that many chimps can get anxiety from living in captivity, which causes them to develop behaviors linked to mental illness. Some of the behaviors observed include rocking back and forth, drinking urine, pacing and hitting their own bodies. (Discovery)