"Not much is known about blue whale songs, although most researchers think that they help males woo their mates, as is the case with closely-related species. That can make any modifications to a cetacean melody fairly high stakes, Dr. de Vos said: “If two populations can’t talk to each other, over time, they’re going to grow apart.”
Interesting article at NY Times: https://nyti.ms/35660zB
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