Dr. Christine Harris co-authored a study that examined whether dogs exhibit jealous behavior, hoping to see if jealousy is an emotion unique to humans. Audie Cornish asks Harris: Does it take complex cognitions to trigger the emotion?
For one month every summer, hundreds of thousands of purple martins stop by an abandoned shopping mall parking lot in Austin, Texas, on their way to the Amazon Basin. Reporter Luke Quinton visited this year's roosting and offers a glimpse of the phenomenon.
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