The adaptive radiation that led to evolution of diverse placental mammals began in the Late Cretaceous.

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Fossil evidence shows the emergence of various groups of placental mammals in the Late Cretaceous, around 66 million years ago. This corresponds with the extinction of non-avian dinosaurs and the opening up of ecological niches, which allowed for the diversification and radiation of placental mammals into various forms and habitats.

The Adaptive Radiation That Led to Evolution of Diverse Placental