Mosquitoes. Bane of backyard picnics -- and deadly in Zika- and dengue-prone regions. Most of the world’s mosquitoes are opportunistic, willing to drink blood from any nearby source. But in some regions, the Aedes aegypti mosquitoes that carry Zika, dengue and yellow fever have evolved to bite humans almost exclusively. But to succeed as a specialized feeder, depending on just one species - humans - to survive, they must have evolved incredibly precise targeting strategies. How do they do it?
 

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