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Whales evolved from sea lion-like ancestors that returned to the sea. We do not know what the whale's land-dwelling ancestors looked like. Early whales were mostly like huge dolphins or killer whales.

One of these, called Basilosaurus, was a slender predator about 21 m long.

Fossil remains of whales are very scarce and not much is known about these animals. The early forms did not have the echo-sounding ability of modern whales and dolphins, which did not evolve until much later.

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Tags: whales, fossils

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