![]() Mammals in the Age of Dinosaurs were generally small, yes, but they were not all meek little insectivores that shivered at the sound of thunderous footsteps. In the long lead-up to the catastrophic cosmic smack, mammals were supposedly at the mercy of the dinosaurs.īut discoveries over the past two decades have shredded this trope. And, the story goes, mammals only really got a chance to flourish after an asteroid cleared the non-avian dinosaurs out of the way around 66 million years ago. The first beasts scurried through the Mesozoic world around 220 million years ago, about 23 million years after dinosaurs got their start. ![]() ![]() Mammals have been around for a very long time.
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