Whales no longer singing the blues?

Endangered blue whales appear to be singing a happier song according to researchers studying the haunting sounds these huge mammals broadcast beneath the waves. Specifically, a drop in frequency has been noticed and a list of possible causes have been examined - from climate change to a rise in human-produced ocean noise - but it seems the explanation could actually be a positive one. It's believed the drop may be caused by the increase of blue whale numbers following bans on commercial whaling activities … in other words, the males don’t need their voices to travel as far to attract a mate.

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