Frogs Go Ultrasonic for Sex (LiveScience.com) Posted on May 11th
Animals compare the intensity of the sound signals received
by their two ears to localize where a sound is coming from. For this reason,
the size ratio of the animal’s head compared to the wavelength of the sound is
important: If the sound waves are much smaller than the head, many waves get
bounced off and the signal coming to one ear is much stronger than to the
other. This large differential, called a sound shadow, helps the animal locate
the noise’s origin.
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