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1993-04-08
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THE WEEK, Page 23HEALTH & SCIENCEPerfect Pitch
Scientists discover a parasitic fly with an unusual ear for
cricket songs
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.
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.
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.