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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

One of the drawbacks of researching blue whales is that most of the time you can't see what your study subjects are doing, or how many there are, or even where they are.

Satellite tags have revealed some of their diving behavior and where they migrate, but tags will never

give a complete picture of the population at large. Because it's really hard to fit a tag in a whale.

Anasurovich, an oceanographer at the Scripps Institution of Oceanography. We have 121 tags that have

been deployed in blue whales, and we're talking about 16 or so years of field

work. So it's not realistic the thing that we can actually go out and just tag all the

animals and figure out that way how many there are. But Sirevich is using another method to track

the underwater giants, eavesdropping on their songs and calls.

That's sped up so you can hear it, by the way. Much of the sound they produce is outside of our hearing range.

Sirovich and her team analyzed more than a decade's worth of blue whale sound, and found that in general, males seem to be more vocal than females.

Especially at night, perhaps because they prefer feeding by day.

It's kind of like they don't like to speak with their mouthful.

When they're feeding, they're focusing on that, and then if they start calling, that's what

they're doing.

And though no one's actually seen blue whales having sex,

Shirovich says this song may have something to do with it.

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