New blues

 

According to this recent article, scientists identified a new group of blue whales because ...

get this ...

they sing differently.

New Blue Whale Population Discovered After Scientists Hear Unknown Song

"In a study published in the journal Endangered Species Research last week, scientists analyzed underwater recordings from the Arabian Sea, extending from the coast of Oman as far south as Madagascar. The team of researchers came across an unfamiliar kind of whale song that had never before been documented in 2017, sparking an international effort to discover the new singer."

and further down:

"As the group analyzed the novel tune, it became clear that it was sung by a previously undiscovered population of blue whales in the western Indian Ocean. As they continued to amass data, they found that the new population likely spends most of its time in the northwestern Indian Ocean."

Here's a link to the actual study paper:

A new blue whale song-type described for the Arabian Sea and Western Indian Ocean

So, the new singers mean that there are more blue whales in the ocean.  And that gets a check mark in the "good" column.