Bats Offer Clues To Treating COVID-19 (IMAGE) University of Rochester Caption Bats--the only flying mammals--are highly mobile, constantly bringing new pathogens into their communities. According to University of Rochester biologists, that's one reason they have evolved to have immunity to so many viruses that plague humans, who have only recently (in evolutionary terms) come to be highly mobile and more likely to live in densely populated centers. Credit Getty Images photo Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.