There is a whale known as the ‘loneliest whale in the world’ because it communicates in a frequency other whales can’t hear
Each year, whales around the oceans call out for mates. They do so in frequencies much lower than anything we can hear; around 17-18 Hertz. There's at least one whale out there, though, that has a pretty squeaky voice.
Okay, so it's not squeaky by our standards, but by whale standards the 52 Hertz that this whale vocalizes is much too high for them to hear. For reference, 52 Hertz is roughly the same frequency of the lowest note on a tuba. What this all adds up to is a whale who can't communicate with anyone.Since it can't communicate, many assume that it doesn't interact with other whales at all!
But what about mating time? Whales tend to go to the same places to mate based on instinct, and this whale follows those patterns as well, but it goes at different times. Its movements have been somewhat similar to that of blue whales, but its timing has been more like that of fin whales.
It was discovered over 30 years ago, so it's healthy despite living in assumed isolation. There's currently a documentary about the whale being shot, so it's likely that a lot of our questions will be answered soon. Until then, we can only hope that this whale is living a happy life.