Reptiles are a diverse group of vertebrate animals that are characterized by their scaly skin, internal fertilization, and usually laying eggs. They include snakes, lizards, turtles, and crocodilians. Research on reptiles often focuses on their behavior, ecology, physiology, evolution, and conservation. This research helps scientists better understand these animals and their roles in ecosystems, as well as informing efforts to protect and conserve threatened reptile species. Some key areas of research in reptiles include their adaptations to different environments, reproductive strategies, and interactions with other species in their habitats.