The 52-hertz whale: The elusive '52 Blue' calling at an unusual frequency in the North Pacific

Summary

The 52-hertz whale, known as "52 Blue," is an individual whale of unidentified species that calls at the unusual frequency of 52 hertz in the north Pacific Ocean. It has never been sighted, only detected via hydrophones since the late 1980s. Its call pattern matches the migration of blue and fin whales, which typically call at 10 to 39 Hz, making this whale unique and often described as the "loneliest whale in the world."

Source

Hacker NewsThe 52-hertz whale: The elusive '52 Blue' calling at an unusual frequency in the North Pacificen.wikipedia.org