The Ayeyarwady pit viper, a new species discovered in Myanmar by Dr. Chan Kin Onn, illustrates the complexities of species differentiation in pit vipers. This species, which displays traits of both the redtail and mangrove pit vipers, was initially thought to be a hybrid but was confirmed as distinct through genomic analysis. Credit: Wolfgang Wüster Finding and describing new species can be a tricky endeavor. Scientists typically look for distinctive characters that can differentiate one species from another. However, variation is a continuum that is not always easy to quantify. At one extreme, multiple species can look alike even though...