Parasitic fly dims vision after finding host, study reveals

Deer keds occasionally bite humans and other mammals, though the article does not detail specific human health impacts.

In the quiet calculus of survival, a small biting fly called the deer ked enacts one of nature's more striking bargains: it arrives at its host with wings and sharp vision, then surrenders both in exchange for a simpler, more permanent existence. Researchers at Aberystwyth University and the University of Florence have now measured the sensory cost of that bargain, finding that the fly's visual sensitivity falls by half once it sheds its wings and settles into life as a parasite. The discovery speaks to a deeper truth about how evolution allocates energy — not toward what an organism once need

Parasitic fly dims vision after finding host, study reveals

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