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 evolutionary biology professor at Arizona State University.
Guests:
Dr. Kevin McGraw
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Comments [2]
I was curious if your guest might know where do birds "hunker down" when a storm comes? we have been getting so many lately I was wondering if they find shelter in anything other than trees?
What is the air velocity of an unladen New Jersey Barn Swallow?
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