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Life sciences/Evolutionary biology/Paleontology/Paleobiology/Mass extinction/Dinosaur extinction

A global, four-year project involving hundreds of scientists shows how avian lineages diverged after the dinosaurs’ extinction.

A tiny, furry-tailed creature was the earliest ancestor of the placental mammals—a group excluding marsupials and egg-laying mammals—and lived after the extinction of the dinosaurs, according to a study in the 8 February Science.

The origins and early evolution of placental mammals have long been a matter of debate.