| http://www.w3.org/ns/prov#value | - NOTE the author uses a waterproofed contact microphone with preamplifier and standard tape recorder, but notes that many feeding sounds (such as limpets, turban shells, and chitons) can actually be heard via a surgical rubber tube or stethoscope tube held in the ear, as long as the test subject is out of water or in water less than about 1cm deep.
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