00:00Giants of prehistoric North America, dinosaurs that roamed ancient landscapes.
00:06Prehistoric North America carried giant sauropods, horned dinosaurs, duck-billed grazers, and apex predators.
00:13Alamosaurus walked through Texas and New Mexico, where massive herds likely stripped tall vegetation from Cretaceous landscapes.
00:22Supersaurus moved through Jurassic Colorado woodlands, stretching a long neck and tail across more than 100 feet.
00:30Sauropocydon towered over Texas and Oklahoma River deltas, reaching treetop foliage with one of the tallest dinosaur necks.
00:38Diplodocus swept its whip-like tail across western North American floodplains, while its long body browsed low plants.
00:46Brachiosaurus raised giraffe-like shoulders in Jurassic forests, feeding high above smaller plant eaters with a powerful elevated neck.
00:54Camarasaurus chewed tough morrison formation plants with thick teeth, leaving fossils across western North America.
01:01Tyrannosaurus rex stalked late Cretaceous floodplains, using huge jaws and serrated teeth to dominate western hunting grounds.
01:09Edmontosaurus grazed North American river valleys with a duck-billed snout and a 40-foot herbivore body.
01:15Triceratops lowered three horns across western plains, defending a six-ton body from predators like Tyrannosaurus rex.
01:24Dilophosaurus ran through early Jurassic Arizona carrying twin head crests and sharp teeth on a slender predator frame.
01:31Giant necks, heavy tails, duck-bills, horns, and crushing jaws once filled America's ancient forests and floodplains.
01:38A fossil skeleton rises in a museum hall while a child looks up at the bones.
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