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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. 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.

Alamosaurus A long-tailed, long-necked, armored plant-eater.

Albertosaurus A meat-eating dinosaur, a tyrannosaurid from the late Cretaceous period.

Ankylosaurus A heavily armored plant-eater with a club-like tail and spikes.

Bagaceratops Printout A plant-eating dinosaur with an armored head.

Baryonyx A large meat-eater from the early Cretaceous period.

Carcharodontosaurus Carcharodontosaurus was an enormous, meat-eating dinosaur - even longer than T. rex.

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

Centrosaurus A ceratopsian dinosaur with a long snout horn.

Chasmosaurus A ceratopsian dinosaur with three horns.

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

Deinonychus A deadly, intelligent, meat-eater with huge, sickle-like claws.

Edmontosaurus A large, duck-billed plant-eater with a bumpy ridge on its back.

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

Gallimimus A fast-running, light-weight theropod from the late Cretaceous period.

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

Hadrosaurus A duck-billed, plant-eating dinosaur from the late Cretaceous period.

Hypsilophodon A small, plant-eating dinosaur that may have lived in herds.

Ichthyornis An extinct bird from the time of the dinosaurs - not a dinosaur.

Ichthyosaurus An extinct marine reptile from the time of the dinosaurs - not a dinosaur.

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

Kronosaurus A large marine reptile from the early Cretaceous period.

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

Leaellynasaura An Australian plant-eating dinosaur with large eyes.

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

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

Muttaburrasaurus A plant-eating dinosaur with thumb spikes.

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

Ornithomimus A fast-moving Cretaceous theropod.

Ouranosaurus A sail-backed plant-eater with a beak.

Oviraptor A small omnivore with a parrot-like head and beak.

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

Pachycephalosaurus A dome-headed plant-eating dinosaur.

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

Parasaurolophus A long-crested plant-eating dinosaur.

Pentaceratops A late Cretaceous plant-eater with horns and a big frill.

Polacanthus An armored and spiked plant-eater.

Protoceratops A ceratopsian 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.

Sauropelta Sauropelta was an armored, plant-eating dinosaur.

Saurornithoides Saurornithoides was a small, fast-moving, meat-eating dinosaur.

Segnosaurus A meat-eating dinosaur from Mongolia.

Spinosaurus A huge meat-eater with a sail-back fin.

Stegoceras A plant-eating dinosaur with a very thick skull.

Stygimoloch A plant-eating dinosaur with many horns and bumps on its skull.

Styracosaurus A plant-eater with many horns on its head.

Thescelosaurus A plant-eating dinosaur whose 4-chambered, fossilized heart has been found.

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

Trachodon A duck-billed dinosaur known from its fossilized teeth.

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

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

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

Tyrannosaurus rex The king of the dinosaurs; a huge meat-eater.

Tyrannosaurus rex Skeleton The king of the dinosaurs; a huge meat-eater.

Utahraptor A fast, intelligent meat-eater with huge, sickle-shaped claws.

Velociraptor A fast, intelligent meat-eater.