In 2013, biologist Alejandro Arteaga had just co-authored a book about the amphibians and reptiles of Mindo, Ecuador, complete with a beautiful, lime-colored eyelash viper on the cover. The only ...

High up in the mountains of Colombia, a scaly creature balanced its 2-foot-long body on a branch. The predator had its red eyes on its next meal. But other sets of eyes were watching it, too. Nearby ...