A tiger walks the same worn groove along the edge of its exhibit, like a broken record. A parrot methodically plucks out its ...

Behaviors often include lying, impulsiveness and aggression. Many of those who've exhibited lifelong antisocial, aka sociopathic, behavior -- lying, impulsiveness, aggression, lacking concern for ...

More than 100 recent cases of delirium, hallucinations and other unusual psychiatric behavior in Japanese patients treated with Tamiflu should have parents watching for similar reactions when treating ...

The treatment of head lice might be worse than the actual lice. (Photo: Getty Images) A disturbing new study has linked a common chemical found in head lice treatments to behavioral difficulties in ...

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 ...

Wildlife experts have issued a warning about a wolf that showed no fear of snowmobiles in the Minnesota wilderness, saying its behavior was "extremely abnormal." The incident happened in the Voyageurs ...