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Blue whales 'singing louder due to climate change'

Antarctic blue whales are believed to sing louder to be heard over melting sea ice as a result of climate change, a new study suggests.
Scientists analysed more than a million recordings of songs from three species of large baleen whales, including the fin whale, the Antarctic blue whale, and three populations of pygmy blue whales.The study, published in the American Geophysical Union's (AGU) Journal of Geophysical Research: Oceans, found Antarctic blue whale calls in the southern Indian Ocean increase in pitch during the summer.
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