| http://www.w3.org/ns/prov#value | - Just not in a way that we can hear.Over the last few decades, biologists using special microphones, recording equipment, and computer analysis programs have realized that whales, elephants, and some other animals were using extremely low-frequency sounds ??? far below the range of human ears ??? to communicate.These low-pitched sounds are known as ???infrasound,??? and they have at least one remar
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