A Malabar gliding frog (Rhacophorus malabaricus) hides between foliage in the Western Ghats mountains in southern India. This family of tree frogs has had more species go extinct than any other amphibian family. Credit: John Wiens For years, many scientists have warned that Earth is undergoing another mass extinction, with species disappearing faster than ever before. These warnings often rely on projecting extinction data from the past 500 years into the future, assuming that current rates are