Paleoart of the raccoon-sized Loxolophus, one of the first larger mammals to arise after the extinction of the dinosaurs. In the absence of competition, they diversified and they grew, and they did so *fast.* This was only the beginning. The ammonite Baculites could grow over six feet long. And despite its survival of the asteroid, the ultimate collapse of ocean ecosystems and perhaps ocean acidification sealed its doom even though it lived to see the seas begin to recover.
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