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This is Scientific American 60 Second Science. I'm Suzanne Bard. During the summer, Blue Whales in the the northeastern Pacific spend their days feeding on massive amounts of tiny plankton called krill.

In fact, krill is all they eat.

It really is remarkable that such a small animal is able to sustain the largest life

form that's ever existed on this planet.

Stanford University marine ecologist will a strike. And to maintain themselves at that body size, they have pretty extreme feeding habits.

A blue whale consumes many tons of krill every day.

Eating keeps the ocean giants occupied during daylight hours when they dive hundreds of feet below the surface where krill congregate in dense swarms.

But at night, when their prey disperse, the whales start to sing.

They're sing for 10, 12 hours straight.

The song you just heard was sped up 10 times.

Which brings the sound up more into human hearing range.

Speeding up the song enables researchers to more easily study

whales deep and resonant songs, which can be heard by other whales across vast distances in the ocean.

It's very likely that Song and Blue Wells is related to some sort of reproductive function,

whether that's attracting a mate or warding off other males.

Since 2015, the Monterrey Bay Aquarium Research Institute

has been recording the songs of Blue Whales

with an underwater microphone attached to the sea floor.

24-7 through 65 days a year giving an audio feed of all of the sounds being produced in

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