AbstractEcological aspects are essential for testing hypotheses about the characteristics, evolutionary processes and behaviour patterns of different taxa. However, for many neotropical lizards, like Gymnodactylus darwinii, such information is scant in the literature. This lizard is endemic to the Atlantic rainforest, occurring from Rio Grande do Norte to SĂŁo Paulo. Herein, the aspects of trophic ecology, microenvironmental specificity and sexual dimorphism were analysed from 65 collected individuals and 15 sighted individuals in two conservation units: Camucim and TapacurĂĄ, located in SĂŁo Lourenço da Mata, northâeastern region of Brazil. The data found classify G. darwinii as a saxicolous lizard, with a preference for rocky outcrops, without sexual dimorphism. According to its trophic ecology, the species is considered a generalist and sitâwait forager. Arthropods, especially Orthoptera and Araneae, dominate the lizard's diet. Neither of these aspects differed between seasons. The present study also shows the importance of the domain conservation, with the aim to provide resources for many vertebrates, especially endemic species.