AfricanGreys.
Flickr/rebeccakoconnor Name: African Grey Parrot Personality: Intelligent (some say African greys are the smartest of the parrot species), affectionate, emotional, and very social, but prone to depression if not properly entertained or attended to. Like many large birds, they are sensitive and can develop neurotic behaviors and depression if left alone, according to About.com. Common Health Issues: Health problems typically found in African greys are respiratory disease, weight loss, seizures, tumors, and self-mutilating behaviors (like feather picking) due to depression says AvianWeb. With proper care, though, these birds can live 50 to 75 years according to About.com. ...