Blue Whale Songs Are Getting Deeper

In addition to being the biggest mammal alive today, blue whales are also the biggest creature to have ever existed. As each blue whale is capable of producing a different frequency to communicate, they are well recognized for their songs. Other whale species can do this as well, but blue whale songs are renowned for their variety and distinctive sound.

We don't know what they use it for, though. Blue whale songs have long been the subject of attempts by marine biologists to decipher them, yet we can only speculate as to their meaning. Additionally, it seems like the songs are getting deeper yearly. Since at least the 1960s, when we first began recording blue whales, they have been steadily moving their tonal frequency downward, and we still don't know why.