A tiger walks the same worn groove along the edge of its exhibit like a broken record. A parrot methodically plucks out its own feathers until bare skin shows through. To a casual visitor, these can ...

Thoughts, feelings, and behaviors can sometimes seem out of step with what is considered typical. When that happens, they can feel overwhelming and interfere with a person's ability to function ...

Across captive settings, nonhuman primates may develop an array of abnormal behaviors including stereotypic and self-injurious behavior. Abnormal behavior can indicate a state of poor welfare, since ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Too much TV might not make your child's eyes go square, but it may ...