The variety of sensory systems that provide signals beyond human experience stretches our imagination, and the search for explanations of how such systems function challenges our most sophisticated technology. Among these systems are the sonars of bats and dolphins, the recognition of patterns of polarized skylight by bees, the magnetic compasses that contribute to global migration by birds, and the use of electric field distortions for orientation and prey detection by fish that inhabit murky waters. Many of these abilities are also linked to communication, as in the waggle danc (which signals the direction ar to nectar by reference to the sun).
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