Flight adaptation in bats may have had an inadvertent negative effects on immune system function, and potentially also on life expectancy.
Comparative Analysis of Bat Genomes Provides Insight into the Evolution of Flight and Immunity, Zhang G. et. al, Science, 25 Jan 2013
Comparative Analysis of Bat Genomes Provides Insight into the Evolution of Flight and Immunity, Zhang G. et. al, Science, 25 Jan 2013