Roadkill likelihood using either species or group of species does not reach to same results. Spatial, climatic, and temporal patterns are consistent within the class Reptilia. Climate and temporal analyses should be performed at species and order level, respectively, for birds. For mammals, climate should be assessed at species level while landscape variables should be evaluated at species level or if not possible at least at order level. Order level seemed to be the best approach to analyze temporal patterns of mammal roadkill.