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1 .This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 .For gentlemen fruit flies in search of a mate, beauty is in the legs of the beholder.
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3 .Because male Drosophila have a sensory system that keeps them from courting flies of a different species.
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4 .And it's located in their forelegs.
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5 .The finding is in the journal Cell.
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6 .When a boy fly approaches a potential partner, he taps her repeatedly on the side with those forelegs.
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7 .But he's not just being a pest.
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8 .Turns out he's checking her out at a molecular level.
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9 .On his legs are sensory neurons equipped with a taste receptor called Gr32a.
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10 .The receptor samples the waxy chemicals on the skin of his love interest.
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11 .If the flavor is that of another species, Gr32a is turned on and the fly high-tails it out of there.
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12 .When researchers removed the males' sensory appendages, or simply disarmed Gr32a, the airborne Romeos tried to mate with any female on six legs.
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13 .They even went for species that were three times larger than themselves, a relationship that even an untrained human eye can see is out of balance.
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14 .The system presumably keeps male flies from wasting their time pursuing females with whom coupling would prove less than fruitful.
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15 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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