Squamata (lizards and snakes)

Squamata is a large group of reptiles that includes lizards and snakes, making up the largest order of reptiles worldwide. They are characterized by a unique skull structure with movable joints, allowing for flexible jaw movement. Most squamates are cold-blooded, have scaly skin, and shed their outer layer periodically. Lizards typically have limbs and external ears, while snakes lack limbs and have specialized, elongated bodies. This group exhibits a wide range of behaviors and habitats, from terrestrial to arboreal and aquatic environments. They play important roles in ecosystems as predators and prey.