Dr. Kevin McGraw appears in the following:
Clothes Make the Man, Markings Make the Bird
Thursday, June 19, 2008
Researchers have found that slightly changing a bird’s appearance also changes its behavior. In a recent study, researchers darkened the reddish breast feathers of male barn swallows using a cheap marker. Within a week, the birds had higher testosterone levels! Dr. Kevin McGraw is co-author of the study and an ...
