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This is Scientific American's 60-second science. I'm Christopher Entagata. Got a minute?

The world's oceans were once home to ten times as many whales,

before the Captain Ahab's of the world came around.

Hunting hit big species the hardest,

wiping out 99% of the Southern Hemisphere's blue whales, for example.

And, as the gentle giants disappeared, so did another lesser-known element of the southern hemisphere's blue whales, for example. And as the gentle giants disappeared,

so did another lesser-known element of the oceans, their poop. I've described it as sort of

like over-steeped green tea, like well-steeped green tea. So it's very diffuse in a big plume.

Joe Roman, a conservation biologist at the University of Vermont.

My daughter's friend say I'm a whale poop scientist. And he says he studies all kinds.

When whales are feeding on krill, they're really high lipids, lots of fat. So it can be, it sort

of clumps together and floats of the surface. So there's a great variety of fecal plumes out there in the oceans.

Whale poop's important because it transports nutrients from the deep ocean up to the surface.

Sproom whales feed on giant squid and other deep sea creatures.

So they'll dive more than a kilometer down.

Then they come to the surface to breathe and digest.

And as it turns out, they poop and they also pee, so they're releasing these nutrients.

...