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Fossilized teeth provide clues to evolution of whales

If you're a fan of whales, then you probably already known that some of the largest ones feed mainly on tiny crustaceans known as krill. They do so by lunging forward and filling their mouths with water, then straining the krill out of that water as they expel it, using fibrous plates in their mouth called baleen. Now, scientists claim to have come a step closer to understanding how that baleen came to be.
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