Dinosaurs and large mammals once roamed America, but very few people realize that these creatures lived where we've built our cities and landmarks. Go on a backwards timeline to see what stood, lived, fought and died in your backyard millions of years ago.
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Sabertooth cats once prowled LA just blocks away from the Oscars red carpet. Duckbilled dinosaurs basked in California’s famous surf -- until they were attacked by fast and agile super-predators. And underneath it all, the ground moved…