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Giant Mammal-Like Footprints Reveal a Hidden World in Dinosaur-Era Brazil
The fossil record has long encouraged a simple picture of mammals during the age of dinosaurs: most were small, while giant reptiles dominated the landscape. Unusually large footprints from an Early Cretaceous desert in Brazil suggest that this picture may be incomplete. Researchers studying the Botucatu Formation in southern Brazil have described two large four-toed…