No one knows why, but there is one suggestion: The drop in tone might indicate a healthy population. Since the whales are more common, they don’t have to “yell” in order to be heard.
The lower pitch is most likely from higher population numbers, which means this is a good thing! It makes sense too, since more numbers means less distance between whales. The 1960s is when the blue whale population really started to suffer, and today the pitch of their songs has decreased 30% since that time.
There are a few theories to this. One is that their numbers have risen, therefore it isn’t necessary to use higher tones to be heard by surrounding whales. Another theory is that the acidity level of the oceans has increased, and lower tones are easier to detect under these conditions.
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