Abstract
Humans potentially can hear between 20 and 20,000 Hz; with age, older human ears often lose part of this range (Yahner 2001). Sounds above 20,000 Hz typically are considered as ultrasounds, such as those of bats, which produce sounds between 25,000 and 140,000 Hz. The term echo refers to the fact that signals are sent out and they bounce back to the sender.
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Yahner, R.H. (2012). Ultrasounds and Other Types of Communication. In: Wildlife Behavior and Conservation. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1518-3_15
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DOI: https://doi.org/10.1007/978-1-4614-1518-3_15
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