Smithsonian.com - How Did Whales Evolve?
"When the fossil data was combined with genetic data by Jonathan Geisler and Jennifer Theodor in 2009, a new whale family tree came to light. Raoellids like Indohyus were the closest relatives to whales, with hippos being the next closest relatives to both groups combined. At last, whales could be firmly rooted in the mammal evolutionary tree."
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