Key points from article :
Researchers analysed the bat species evolutionary tree.
Found four bat lineages that exhibit extreme longevity.
Humans tend to live about four times longer than most other mammals when adjusted for size.
But if these bats were human size they would live 240 years.
Vampire bats don't hibernate but can vary their body temperature throughout the day.
Allows them to conserve energy (if not had a meal) but may also help them to fight infection.
