Naish argues that a dinosaur world might still have much of the present diversity of modern birds. Mammals, however, are a different story. Though they had already been around for perhaps 160 million years when the asteroid struck, they were still “marginal, shadowy little creatures” says Brusatte, diverse but typically small and restricted to specific niches. “It was only the shock of the asteroid knocking off the incumbent dinosaurs that allowed them to break free,” he says.

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