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Early whale evolution - Ambulocetus and Pakicetus - showing how hippos and whales evolved - hippos are the whales' closest relatives!

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Thylacosmilus atrox and Thylacoleo carnifex by Saúl Velasco Martel

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Thylacosmilus atrox had huge saber-like teeth but its bite was weaker than that of a domestic cat.

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Rise of the Cetacea: Part 1 - The Pakicetids ~ ROTC Pakicetus fig