Modesto and Anderson reviewed the numerous earlier definitions and proposed a modified definition, which they meant to retain most traditional content of the group while maintaining it steady and monophyletic. They defined Reptilia as all amniotes nearer to Lacerta agilis and Crocodylus niloticus than to Homo sapiens. This stem-based definition is equivalent to the more frequent definition of Sauropsida, which Modesto and Anderson synonymized with Reptilia, because the latter is healthier identified and more frequently used. Unlike most earlier definitions of Reptilia, however, Modesto and Anderson's definition contains birds, as they're throughout the clade that features each lizards and crocodiles.…