How important are bats to maintaining a healthy ecosystem and what caused more than a million hibernating bat deaths in the U.S. since 2006? We’ll talk this hour with writer David Quammen, whose article “Bat Crash,” appears in the current issue of National Geographic Magazine.

Will politics threaten the existence of Russia’s healthy salmon population and the communities that depend on it for survival? We’ll explore the plight of the remote Kamchatka Peninsula with writer David Quammen, whose article “Where the Salmon Rule,” appears in the current issue of National Geographic.

Is cancer becoming contagious? We’ll spend this hour with journalist David Quammen, whose current Harper’s Magazine cover story, “Contagious Cancer: The Evolution of a Killer,” examines the on-going advancement of the disease.