The primary function of skin in animals is to serve as a protective barrier against various external threats, including pathogens, toxins, and physical injuries. Skin plays a crucial role in maintaining homeostasis by regulating body temperature and preventing dehydration. Additionally, it facilitates the sensation of touch, pain, and temperature through specialized nerve endings, providing essential information about the environment. In some species, skin also contributes to camouflage or displays signaling characteristics for communication. Overall, skin is vital for survival and well-being across diverse animal taxa.