While bird flu concerns are increasing across the country, the Maryland Zoo in Baltimore has been protecting its flock from the virus for years. The zoo has a program that monitors wild birds at the zoo and discourages them from sharing space with its bird collection.

The widening U.S. bird flu outbreak has made its way to Maryland, which has counted two cases on commercial poultry farms — one in Caroline County and another in Queen Anne’s County — since the start of the year.