52-hertz whale - Wikipedia

The signal was recorded in the northeast Pacific. It has been sped up ten times, raising the pitch to 520 Hz (C5). The sonic signature is that of a whale, albeit at a unique frequency. The call patterns resemble neither blue nor fin whales, being much higher in frequency, shorter, and more frequent.[5] Blue whales usually vocalize at 10–39 Hz,[2] fin whales at 20 Hz.[1] The calls of this whale are