Reptilian species refer to a diverse group of cold-blooded vertebrates that include snakes, lizards, turtles, and crocodilians. They are characterized by their scaly skin, which helps prevent water loss, and their ability to regulate body temperature through external sources. Reptiles are found in various habitats, from deserts to forests, and play essential roles in ecosystems as predators and prey. In popular culture and conspiracy theories, the term "Reptilian" often refers to a fictional extraterrestrial species that is said to resemble reptiles. These beings are often depicted as shape-shifters who infiltrate human society, a concept popularized by figures like David Icke. However, there is no scientific evidence supporting the existence of such creatures.