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Pygmy blue whales deepen their moans

Scientists can’t explain steady decline in vocalization frequencies

Pygmy blue whale

SING LOW  Pygmy blue whales (one pictured) off the coast of Sri Lanka are changing their calls. Over a decade, one call component has steadily gotten deeper. 

ShaneGross/iStockphoto

By Meghan Rosen

- More than 2 years ago

SALT LAKE CITY — In the Indian Ocean off the coast of Sri Lanka, pygmy blue whales are changing their tune — and they might be doing it on purpose.