You Have No Idea How Good Mosquitoes Are at Smelling Us
The insects have infinite backup plans for hunting us down.
Nothing gets a female mosquito going quite like the stench of human BO. The chase can begin from more than 100 feet away, with a plume of breath that wafts carbon dioxide onto the nubby sensory organ atop the insect’s mouth. Her senses snared, she flies person-ward, until her antennae start to buzz with the pungent perfume of skin. Lured closer still, she homes in on her host’s body heat, then touches down on a landing pad of flesh that she can taste with her legs. She punctures her victim with her spear-like stylet and slurps the iron-rich blood within.
The entire ritual is intricate and obsessive — and nearly impossible to disrupt. Of more than 3,500 mosquito species that skulk about the planet, fewer than 10 percent (and only the females, at that) enjoy nibbling on humans. But once they’re on the prowl for people, neither rain nor zappers nor citronella candles will deter them. From the tips of their antennae to the bottoms of their little insect feet, these human-loving mosquitoes bristle with human-sensing accouterment, says Leslie Vosshall, a neurobiologist at Rockefeller University. “They really are in the business of finding us.”
