Definition: The word 'reptile', as we know it today, was a specific type of animal that lived in the order Carnivora. It's often associated with animals like snakes (genus Serpentes) or lizards (family Ixodidae). The term reptile originally meant a creature that lay eggs. In zoology, a "reptile" is an organism belonging to the order and class Leporidae, which includes many known genera such as the crocodile, alligators, turtles, snakes, and lizards. Reptiles are divided into three main groups: tetrapods (bones at one end, but no backbone), pterosaurs, and ichthyosaurs. Some of them like the crocodiles are also considered reptiles. Reptiles can be categorized as having scales or feathers to help them regulate temperature, although not all species have hair on their skin. Most reptiles lack legs or appendages (feathers) and instead rely on moist, slow-moving aquatic habitats such as mudflats, rivers, lakes, streams, and swamps. The word "reptile" is now often used to describe any animal that has scales or feathers for protection. The term can also refer to reptiles in general, including the types of animals that have feathers but are not covered with scales. It's important to note that the term reptile originally referred to a specific type of animal and its descendants like snakes, lizards, and turtles. Reptiles have since been generalized across the order and class Leporidae, which includes all the known genera such as crocodiles, alligators, turtles, snakes, and lizards.