Tiny teeth reveal proto-monkeys spread widely across North America 66 million years ago

Tiny teeth found in Colorado reveal proto-monkeys, Purgatorius, lived in North America much earlier and farther south than previously known. These fossils, discovered by meticulously sifting sediment, suggest Purgatorius ranged across North America approximately 66 million years ago, potentially showing early diversification within the group. The findings indicate that early primate ancestors were present alongside dinosaurs and began diversifying before their extinction, with further discoveries expected.