Which animal has the highest average body temperature?

With the exception of insects, hummingbirds have the highest metabolism rate of any animal on earth (high breathing rate, high heart rate, high body temperature).

Their wings beat seventy times each second; and their hovering flight used by them to gather nectar requires staggering amounts of energy. Their daytime body temperature ranges from 105° to 108°F (40.5° to 42.2°C).