In 1989, oceanographers heard the unusual call of the "52-hertz whale" for the first time, thanks to an array of hydrophone sensors that had recently been declassified by the U.S. Navy. Thought to be a blue whale because of its migration patterns, this whale "sings" at a unique frequency -- 52 hertz. This is a much higher frequency than the call of a typical blue whale (10–39 Hz) or a fin whale (20 Hz). In the years since, the 52-hertz whale has been detected regularly in many locations around the Pacific Ocean. He or she appears to be the only whale emitting a call at this high frequency, earning the nickname “the world's loneliest whale.”
Over the years, this whale has regularly been heard in the Pacific Ocean between August and December, before migrating beyond the range of the hydrophones. The whale travels as far north as the Aleutian and Kodiak Islands, and as far south as the California coast.
The odd whale out?