Mammals grew big after dinosaurs died but their brains stayed small

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Mammals grew big after dinosaurs died but their brains stayed small
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After the dinosaurs went extinct, mammals took over and had room to evolve larger bodies – but it was millions of years before their brains got big too.

A reconstruction of the brains inside the skulls of the mammals Arctocyon primaevus , which lived about 59 million years ago, and Hyrachyus modestus , which lived about 45 million years agomass extinction 66 million years ago that wiped out all of the dinosaurs

apart from the birds, mammals underwent an evolutionary explosion. The small species that survived the consequences of the asteroid-triggered “end-Cretaceous” event diversified and began to evolve into new niches, filling forests that sprung up from the ashes of the …App + Web

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