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The Cretaceous Period was the last portion of the Mesozoic Era and the heyday of the dinosaurs; it was preceded by the Jurassic Period.

Most of the known dinosaurs lived during the Cretaceous period. The Cretaceous Period lasted from 144 to 65 million years ago. During this time, mammals flourished; flowering plants evolved and changed the landscape radically. There was a high level of tectonic activity (continental plate movement) and accompanying volcanic activity.

The Cretaceous period ended 65 million years ago with the extinction of the dinosaurs and many, many other prehistoric life forms. This mass extinction was the second-most extensive in the history of the Earth.

Acrocanthosaurus A huge, spine-backed meat-eater. (early Cretaceous)

Alamosaurus A long-tailed, long-necked, armored plant-eater. (late Cretaceous)

Alamosaurus (Simple Version) A long-tailed, long-necked, armored plant-eater. (late Cretaceous)

Albertosaurus A meat-eating dinosaur, a tyrannosaurid. (late Cretaceous)

Ankylosaurus A heavily armored plant-eater with a club-like tail and spikes. (late Cretaceous)

Ankylosaurus (Simple Version) A heavily armored plant-eater with a club-like tail and spikes. (late Cretaceous)

Bagaceratops A plant-eating dinosaur with an armored head. (late Cretaceous)

Baryonyx A large carnivore that ate fish. (early Cretaceous)

Carcharodontosaurus Carcharodontosaurus was an enormous, meat-eating dinosaur - even longer than T. rex. (early to middle Cretaceous)

Carnotaurus A Cretaceous theropod (a meat-eating dinosaur) with brow horns. (late Cretaceous)

Centrosaurus A ceratopsian dinosaur with a long snout horn. (late Cretaceous)

Chasmosaurus A ceratopsian dinosaur with three horns. (late Cretaceous)

Corythosaurus A large, duck-billed plant eating dinosaur that had a helmet-like crest on its head. (late Cretaceous)

Corythosaurus (Simple version) A large, duck-billed plant eating dinosaur that had a helmet-like crest on its head. (late Cretaceous)

Deinonychus A deadly, intelligent, meat-eater with huge, sickle-like claws. (middle Cretaceous)

Deinonychus (Simple version) A deadly, intelligent, meat-eater with huge, sickle-like claws. (middle Cretaceous)

Edmontonia An armored, plant-eating dinosaur from North America. (late Cretaceous)

Edmontosaurus A large, duck-billed, plant-eating dinosaur that had a bumpy ridge on its back.

Edmontosaurus (Simple version) A large, duck-billed, plant-eating dinosaur that had a bumpy ridge on its back. (late Cretaceous)

Elasmosaurus A swimming fish-eater with four flippers and a very long neck - not a dinosaur. (late Cretaceous)

Gallimimus A fast-running, light-weight theropod. (late Cretaceous)

Giganotosaurus The largest meat-eating dinosaur yet found; this giant was even bigger than T. rex.

Giganotosaurus (Simple version) The largest meat-eating dinosaur yet found; it was even bigger than T. rex. (middle Cretaceous)

Hadrosaurus A duck-billed, plant-eating dinosaur. (late Cretaceous)

Hypsilophodon A small, plant-eating dinosaur that may have lived in herds. (early Cretaceous)

Ichthyornis An extinct bird from the time of the dinosaurs - not a dinosaur. (late Cretaceous)

Ichthyosaurus An extinct marine reptile from the time of the dinosaurs - it was not a dinosaur. (early Jurassic to early Cretaceous)

Iguanodon A slow, heavy, herding, plant-eating dinosaur that had thumb-spikes. Iguanodon was the second dinosaur discovered.

Iguanodon (Simple version) A slow, heavy, herding, plant-eating dinosaur that had thumb-spikes. Iguanodon was the second dinosaur discovered. (early Cretaceous)

Kronosaurus A large marine reptile. (early Cretaceous period).

Lambeosaurus Lambeosaurus was a plant-eating dinosaur with a tall, hollow, bony crest on its head. (late Cretaceous)

Leaellynasaura An Australian plant-eating dinosaur with large eyes. (middle Cretaceous)

Maiasaura A duck-billed, herding, plant-eating dinosaur that cared for its young.

Maiasaura (Simple version) A duck-billed, herding plant-eater that cared for its young. (late Cretaceous)

Megaraptor A large predatory dinosaur with a huge, sickle-shaped claw on each foot. (late Cretaceous)

Muttaburrasaurus A plant-eating dinosaur with thumb spikes. (middle Cretaceous)

Nodosaurus A large, armored, plant-eating dinosaur from the early Cretaceous period, about 113-98 million years ago.

Ornithomimus A fast-moving, long-legged meat-eating dinosaur. (late Cretaceous)

Ouranosaurus A sail-backed plant-eater with a beak. (early Cretaceous)

Ouranosaurus (Simple version) A sail-backed plant-eater with a beak. (early Cretaceous)

Oviraptor A small omnivore with a parrot-like head and beak. (late Cretaceous)

Oviraptor (Simple version) A small omnivore with a parrot-like head and beak. (late Cretaceous)

Pachycephalosaurus A dome-headed plant-eater. (late Cretaceous)

Pachycephalosaurus (Simple version) A dome-headed plant-eater. (late Cretaceous)

Panoplosaurus A tank-like, spiked, plant-eating dinosaur from the late Cretaceous period.

Parasaurolophus A long-crested plant-eating dinosaur. (late Cretaceous)

Parasaurolophus (Simple version) A long-crested plant-eating dinosaur. (late Cretaceous)

Pentaceratops A plant-eating dinosaur with horns and a big frill. (late Cretaceous)

Polacanthus An armored and spiked plant-eating dinosaur. (early Cretaceous)

Protoceratops A ceratopsian dinosaur from the late Cretaceous period.

Protoceratops (Simple version) A ceratopsian dinosaur from the late Cretaceous period.

Pteranodon Big, flying meat-eaters from the late Cretaceous - not a dinosaur.

Quaesitosaurus A large, long-necked, whip-tailed plant-eating dinosaur from the Gobi Desert. It lived during the late Cretaceous period.

Saltasaurus A large, long-necked plant-eating dinosaur with armor on its back. It lived during the late Cretaceous period.

Saurolophus Saurolophus was a duck-billed, plant-eating dinosaur. (late Cretaceous)

Sauropelta Sauropelta was an armored, plant-eating dinosaur. (early Cretaceous)

Saurornithoides Saurornithoides was a small, fast-moving, meat-eating dinosaur. (late Cretaceous)

Segnosaurus A meat-eating dinosaur from Mongolia. (late Cretaceous)

Spinosaurus A huge meat-eater with a sail-back fin. (late Cretaceous)

Spinosaurus (Simple Version) A huge meat-eater with a sail-back fin. (late Cretaceous)

Stegoceras A plant-eating dinosaur with a very thick skull. (late Cretaceous)

Stygimoloch A plant-eater with many horns and bumps on its skull. (late Cretaceous)

Styracosaurus A plant-eater with many horns on its head. (late Cretaceous)

Thescelosaurus A plant-eating, bipedal dinosaur. (late Cretaceous)

Torosaurus A plant-eating dinosaur with three horns and a huge, bony frill. (late Cretaceous)

Trachodon A duck-billed dinosaur known from its fossilized teeth. (late Cretaceous)

Triceratops A plant-eating dinosaur with three horns and a frill on its head. (late Cretaceous)

Triceratops, Simple version A plant-eating dinosaur with three horns and a frill on its head. (late Cretaceous)

Triceratops Skeleton A plant-eating dinosaur with three horns and a frill on its head. (late Cretaceous)

Troödon A fast-moving meat-eater from the late Cretaceous period.

Tyrannosaurus rex The king of the dinosaurs; a huge meat-eater. (late Cretaceous)

Tyrannosaurus rex, Simple version The king of the dinosaurs; a huge meat-eater. (late Cretaceous)

Tyrannosaurus rex Skeleton The king of the dinosaurs; a huge meat-eater. (late Cretaceous)

Utahraptor A fast, intelligent meat-eater with huge, sickle-shaped claws. (middle Cretaceous)

Velociraptor A fast, intelligent meat-eater. (late Cretaceous)