This blood-feeding fly sacrifices its sight after finding a host

Deer keds rely on flight and vision to find a host, but everything changes once they land. After shedding their wings forever, these parasites reduce the activity of key vision-related genes by about half. Scientists believe they are effectively trading sharp eyesight for extra energy that can be used for feeding and reproduction.

Raccontata daphys.orgnautil.ussciencedaily.comeurekalert.org