"When bats fly, their metabolism can rev up to 15 to 16 times above its resting state; their heart rate may soar above 1,000 beats per minute; their body temperature can exceed 105 degrees Fahrenheit, effectively plunging the animals into an epic fever state. Put all of that on virtually any other mammal, and their body would likely be overwhelmed by the blaze of extreme inflammation, the toxic by-products of their metabolism effectively rending cells apart."

https://www.theatlantic.com/health/archive/2023/11/bat-disease-virus-health-aging/675943/