Recently unearthed fossils of old-world monkeys are believed to be 12.5 million years old, making them the oldest-known ancient monkey fossils to date, scientists say. The teeth, discovered in 2006 in western Kenya, predate the previously oldest-known fossils by 3 million years and are believed to belong to an early species of colobine monkeys. Scientists say the findings, published in the journal Proceedings of the National Academy of Sciences, help connect the dots on how old-world monkeys survived and beat out competition.

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