WEST LAFAYETTE, Ind. - The bird doing loop-the-loops in the cage and pulling out its feathers is not just playing and preening. Stress may cause these activities and also may provide insight into ...

Forbes contributors publish independent expert analyses and insights. GrrlScientist writes about evolution, ecology, behavior and health. If you visit Peru, you may be lucky enough to witness one of ...

A 37-year-old female yellow-headed Amazon parrot (Amazona ochrocephala oratrix) was presented after a 4-month-period behavior change and intermittent episodes of obtimded mentation. Clinical findings ...

Two football-shaped bunches of feathers nap peacefully on a branch inside a low, gray building at the Bronx Zoo in New York City. These St. Vincent Amazon parrots, miles from their natural habitat and ...