Some Pittsburgh restaurants are collecting oyster shells for new homes for baby oysters. More than eight billion 'spat on shell' have been added to the bay in the effort.
With development encroaching on wild areas around Pittsburgh, encounters between wildlife and humans are becoming more common. It's Doug Bergman's job to keep the peace.
Janet Clayton's 30-year career studying freshwater mussels has helped provide the knowledge to save these animals from extinction. But many challenges remain.
