What is the difference between the reptilian and mammalian?

The primary difference between reptiles and mammals lies in their physiological and anatomical characteristics. Reptiles are ectothermic (cold-blooded) and typically lay eggs, possessing scales or scutes on their skin. In contrast, mammals are endothermic (warm-blooded), usually give live birth, and have fur or hair along with mammary glands for nursing their young. Additionally, mammals generally have a more complex brain structure and a greater capacity for social behavior compared to reptiles.