A small, secretive group of lizards that still exists today may have been the only terrestrial vertebrates that survived in the vicinity of the Chicxulub asteroid collision, which led to the extinction of the non-avian dinosaurs. It has long been known that xantusiid night lizards are an ancient lineage that have persisted for tens of millions of years. But Chase Brownstein at Yale University and his colleagues suspected that the group may have actually arisen earlier than previously thought: in the Cretaceous Period, which ended around 66 million years ago.
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