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Nature 440, 333-336 (16 March 2006) | doi:10.1038/nature04416;
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Ultrasonic communication in frogs
Among vertebrates, only microchiropteran bats, cetaceans and some rodents are known to produce and detect ultrasounds (frequencies greater than 20|[thinsp]|kHz) for the purpose of communication and/or echolocation, suggesting that this capacity might be restricted to mammals. Amphibians, reptiles and most birds generally have limited hearing capacity, with the ability to detect and produce sounds below |[sim]|12|[thinsp]|kHz.
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