A blood-feeding parasitic fly loses visual sensitivity after finding a host and permanently giving up flight, new research shows.

Deer keds—biting flies found across Europe, Asia, Africa and the Americas—use their eyes and flight to locate a host, typically deer, but occasionally humans or other mammals.…

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…

A blood-feeding parasitic fly loses visual sensitivity after finding a host and permanently giving up flight, new research shows.