| http://www.w3.org/ns/prov#value | - Just as humans are almost blind, in that they don???t see ultraviolet or infrared light, they are also nearly deaf, as they do not hear ultrasounds (N > 20 kHz)???unlike dogs and bats, for example???or infrasound (N < 20 Hz), which is used by certain animals such as elephants and giraffes [and whales] for communicating.
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