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This is Scientific American 60-second science. I'm Annie Sneed.

Baleen whales are the gentle giants of the sea. Despite their colossal size, they feed on tiny creatures such as krill and zooplankton.

That's because these whales, instead of teeth, have bristle-like structures in their mouth, Baleen, which filters out small critters from big gulps of water.

But the ancestors of Baleen whales had a very different diet.

So the oldest, the oldest whales that we know, so these are the ancestors not just of the

sort of great whales like the blue well and the humpback well, but also of all of the dolphins

in the sea today.

They had fairly big teeth.

Felix Marx, a postdoctoral research fellow at the Royal Belgian Institute of Natural Sciences.

And the most common idea is that they ate relatively large fish.

For some of the biggest ones, there are some studies that look specifically at the wear of those teeth

at a microscopic level, and they seemed to suggest that they ate almost anything

that they came across. The point is they had big teeth that were really sharp, and that were

even relative to the size of their jaws were relatively large. And so they really were

predators. So where did Balene come from? Marks and his colleagues set out to answer this question.

They analyzed the

mouth of a 34 million-year-old fossil of one of the earliest baleen whales called Janocytis

...