The high body temperature of birds helps to keep them active and maintain a fast metabolism. Birds need a lot of energy to fly, so they need to be able to generate a lot of heat. Their high body temperature also helps them to stay warm in cold weather.
Birds have several adaptations that help them to maintain their high body temperature. One adaptation is their thick layer of feathers. Feathers help to insulate birds and keep them warm. Another adaptation is their circulatory system. Birds have a very efficient circulatory system that helps to distribute heat throughout their bodies.