Whale songs' changing pitch may be response to climate changes

Over several decades blue whales pitches have been dropping, but the reason remained a mystery until recently. The study analyzed the song from three species of whale: Antarctic blue, fin, and pygmy blue whale. The study shows that variations in the whales pitches are related to breaking ice in the Southern Indian Ocean. Whales call louder in the summer so they can be heard over the breaking ice. Due to the growing number of whales they can decrease their intensity of the calls to keep in touch.The research rules out noise pollution as the global long-term end. The study also suggest that the drop in the pitches is an anatomical consequence.

At first this seemed concerning to think some type of pollution is causing whales to become almost silent, but it was a relief to find out that noise pollution wasn't the issue.

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