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1963
The cries of bats, although unperceived by our unaided ears, may be made audible by simple electronic apparatus. With such a detector, it is fascinating to observe a bat navigating, negotiating obstacles and catching its prey in the dusk, and to remember that this performance is achieved by acoustic means.
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The cries of bats, although unperceived by our unaided ears, may be made audible by simple electronic apparatus. With such a detector, it is fascinating to observe a bat navigating, negotiating obstacles and catching its prey in the dusk, and to remember that this performance is achieved by acoustic means.
openaire +1 more source