Researchers in Scotland have studied human subjects' email behavior and identified twelve distinct personalities, each of which matches up with the behavior of a bird. The boorish parrot sends abusive or inappropriate emails and fails to understand why others get upset; night owls send messages late at night and do not appreciate others' needs for some time off; and compulsive woodpeckers cannot resist the urge to check, check, check day and night. The research's conclusion is that email is a great source of stress to many people.