The mystery of the disappearing frogs Witness History

How scientists discovered that a deadly fungus was killing off amphibians around the world. The chytrid fungus has caused the greatest loss of biodiversity in our time. Alejandra Martins spoke to biologist Dr. Karen Lips, one of the key scientists who unravelled the mystery of the extinctions. Photo: dead frog infected with chytrid fungus. Credit: Forrest Brem