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When Whales Could Walk (Español)
Un espectacular cementerio de fósiles revela una ballena de 43 millones de años que tenía cuatro patas y podía caminar. Sigue a los científicos en su búsqueda de nuevas pistas sobre cómo los mamíferos se trasladaron de la tierra al mar para convertirse en los animales más grandes de la Tierra.
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