 They defined Reptilia as all amniotes closer to "Lacerta agilis" and "Crocodylus niloticus" than to "Homo sapiens".This stem-based definition is equivalent to the more common definition of Sauropsida, which Modesto and Anderson synonymized with Reptilia, since the latter is better known and more frequently used.Unlike most previous definitions of Reptilia, however, Modesto and Anderson's definition includes birds, as they are within the clade that includes both lizards and crocodiles.