A red fox is warm-blooded. This means that it can regulate its body temperature internally, regardless of the temperature of its environment. Warm-blooded animals, also known as endotherms, maintain a stable internal temperature to ensure that their bodily functions operate efficiently.
Red foxes, like other mammals, have adaptations such as fur and a layer of fat that help keep them warm in colder climates. This ability to maintain their body heat allows them to thrive in a variety of environments, from forests to tundras. In contrast, cold-blooded animals, or ectotherms, depend on external sources of heat to regulate their body temperature, which makes them less capable of surviving in extreme temperatures.