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This is Scientific Americans' 60-second science. I Karen Hopkin. When it comes to sucking blood,

mosquitoes can play favorites. They show preferences for particular species or even certain individuals.

At the same time, their taste can change, depending on the circumstances. One species of Skeeter

in California, for example, has a fondness

in summer for robins, but will settle for mammals once the birds head south for the winter.

But how do mosquitoes decide what's on the menu, and when to shift to something new? It appears

they play it by nose, and by their intended victim's behavior, because a new study

shows that mosquitoes not only memorize the scent of their preferred host, they can use these

olfactory cues to avoid individuals who try to swat them. The finding is in the journal Current

Biology. Researchers took female mosquitoes of the species 80sgypti and loaded them one by one into a maze

shaped like a y. One arm of the y was suffused with the scent of a human volunteer. The other

contained a control solution of mineral oil. As predicted, the mosquito showed an obvious preference

for Oda homo sapien. Next, the researchers attempted to train the mosquitoes to flee from the heady aroma of humans.

So, they coupled the exposure to human odor with a mechanical vibration,

something akin to the shock that might accompany a near-miss by a swatting host.

Sure enough, mosquitoes that were trained to associate human smells with their

potentially deadly defensive maneuvers lost their appetite for the previously attractive scent.

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