What Happened To The Crows?

A listener thought she’d noticed a change in Chicago’s crow population. And she was right. More than twenty years ago, the crow population of Illinois was at an all-time high. But just a few years later, half of the birds were dead. The crows were hit by a deadly virus. And it’s one that humans are susceptible to as well. So where was this virus coming from? Reporter Claire Caulfield finds the answer.