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- THE WEEK, Page 23HEALTH & SCIENCEPerfect Pitch
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- Scientists discover a parasitic fly with an unusual ear for
- cricket songs
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- All summer long, male field crickets can be heard singing
- love songs to lure willing mates. But female crickets are not the
- only creatures these songs attract. Researchers reporting in
- Science magazine say they have found a tiny fly of the Ormia
- genus that can home in on a singing male as quickly as any
- lovesick cricket. How do they do it? With a hearing organ that
- works remarkably like a cricket's ear.
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- Mosquitoes and other flies that make noise have feathery
- antennas to pick up low-frequency fly buzzing. Crickets, by
- contrast, make high-frequency chirps that require mechanisms
- much akin to eardrums to hear these sounds.
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- In a classic example of what scientists call evolutionary
- convergence, female Ormia flies and female crickets have
- developed similar eardrum-like devices to serve differing goals:
- female crickets need male crickets to mate; female flies also
- need male crickets to reproduce. They use them as depositories
- for parasitic larvae that infest, feed on and ultimately kill
- their hosts.
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