The adaptive radiation of mammals began following the Mesozoic extinctions.

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The adaptive radiation of mammals, which refers to the rapid evolution of mammals into a wide variety of forms and ecological niches, indeed began following the Mesozoic extinctions, particularly after the Cretaceous-Paleogene (K-Pg) extinction event about 66 million years ago that marked the end of the Mesozoic Era. This event led to the decline of dinosaurs, opening up ecological niches for mammals to diversify and evolve into.

The Adaptive Radiation of Mammals Began Following the Mesozoic Extinctions