Nature (1982)

A look at the difficulties of raising parrots. The intelligent birds have a life span of 80-90 years, which means they often live longer than their owners—when their owners don't give them up after a few years, that is. They also form strong bonds with caregivers, which can result in odd behavior if a caregiver leaves for an extended period of time, as Liz and Russ Hartman learned: their bird became so upset while Russ was away on a business trip that it plucked all the feathers from its chest.