Reptiles are a class of cold-blooded vertebrates characterized by their scaly skin, lungs for breathing air, and ability to lay shelled amniotic eggs on land. They are primarily terrestrial and include animals such as lizards, snakes, turtles, crocodiles, and tuataras.
Reptiles are found worldwide but are especially abundant in warm regions. They exhibit a variety of adaptations for survival in diverse habitats ranging from deserts to rainforests and freshwater to marine ecosystems.