Camarasaurus Skull

(Image credit: © 2003 Calvin J. Hamilton ScienceViews.com)This skull cast is from Dinosaur National Monument, Utah. It dates to the Jurassic Period, about 150 million years ago. This picture was taken on Nov. 10, 2003 at the Smithsonian National Museum of Natural History.

Tyrannosaurus Rex

(Image credit: © 2003 Calvin J. Hamilton ScienceViews.com)This is the skull of the most complete Tyrannosaurus rex ever found. The Black Hills Institute of Geological Research in Hill City, South Dakota excavated it. This picture was taken on Nov. 10, 2003 at the Smithsonian National Museum of Natural History.

Velociraptor Skull

(Image credit: Courtesy American Museum of Natural History)Velociraptor, which means “speedy thief,” had a sharp, deadly, sickle-shaped, retractable, 3.5-inch (9 cm) claw on each foot (located on each second toe). The Velociraptor may have been able to run up to roughly 40 mph (60 km/hr) for short bursts. This predator may have hunted in packs.

Uberabasuchus Terrificus

(Image credit: AP Photo/Universidade Federal de Rio de Janeiro, HO)A skull of the Uberabasuchus Terrificus, a fossil of a prehistoric crocodile, was discovered nearly intact in Uberaba where the dinosaur lived some 70 million years ago.

Fossil Site

(Image credit: NASA)This true color Landsat 5 image of the Gobi desert covers an area between Ukhaa Tolgod and the Flaming Cliffs, two of Mongolia's most famous fossil sites. Landsat data are more accurate than existing maps of the region, so they are extremely helpful in the search for fossils.

Dinosaur Eggs

(Image credit: © 2003 Calvin J. Hamilton ScienceViews.com)Many fossilized dinosaur eggs have been found, at over 200 sites around the world. Very rarely do the eggs have the preserved parts of embryos in them, so it is often difficult to determine the species of the dinosaur. This picture was taken on July 7, 2003 at Port Angeles, Washington.

Intact Embryo

(Image credit: ESO [(Negative #17089)/(Mark Ellison) Courtesy Dept. of Library Services, American Museum of Natural History])The discovery of dinosaur eggs at the Flaming Cliffs —with intact embryos—stunned the world in the 1920s.

Oviraptor Nest

(Image credit: ESO[(Negative #5789) Courtesy Dept. of Library Services, American Museum of Natural History])This oviraptor nest—filled with eggs—demonstrates one of the most surprising finds from the Gobi Desert that some dinosaurs cared for their young.

Finding Fossils

(Image credit: ESO [Courtesy American Museum of Natural History])Finding fossils in the desert takes a skilled eye. This photograph of a protoceratops skull (the hammer is for scale) shows how fossils look before they are excavated.

Juvenile Protoceratops

(Image credit: Courtesy American Museum of Natural History)Shown above is the post-excavated picture of a Juvenile Protoceratops. (see previous picture). Known as the ‘fighting dinosaur,’ the Velociraptor was a fierce carnivore that hunted prey animals, such as the plant-eating Protoceratops.

Neuquenraptor Argentinus

(Image credit: Photo courtesy of Fernando Novas, Argentine Museum of Natural History)Shown above is a photo of a fossil foot of new raptor dinosaur species, Neuquenraptor argentinus.

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