Why aren't blue whales singing? Study explains.

Changing ocean conditions making whale prey scarce are causing the mammals to stop singing, a recent study has found.

Researchers at the Monterey Bay Aquarium Research Institute, Cascadia Research Collective and other national institutions spent six years monitoring the acoustic sounds of blue, fin and humpback whales off the California coast from July 2015 to June 2021, according to a study published in February .