The Stegosaurus had the smallest brain for its body size of any known dinosaur. Its body was the size of a van, but its brain was the size of a walnut (about 2.8 oz).

Mary Anning was an English fossil hunter whose observations played a key role in the discovery that coprolites, known as bezoar stones at the time, were actually fossilized feces.

The Oviraptor, whose name is Latin for "egg taker", was characterized by its toothless, parrot-like beak.

A gastrolith, also called a stomach stone or gizzard stone, is a rock held inside a gastrointestinal tract and used to grind food in animals lacking suitable grinding teeth. Polished pebbles occasionally found within skeletons of giant herbivorous sauropod dinosaurs are very likely to be gastroliths.

In 1868, Hadrosaurus foulkii became the first dinosaur skeleton to ever be mounted. Three stories high, the monstrous animal drew record-breaking crowds at Philadelphia's Academy of Natural Sciences.

The smallest known pterodactyl, the Nemicolopterus crypticus (discovered in 2008), had a wingspan of only 10 inches.

Qantassaurus was named after the Australian airline Qantas, which helped transport the fossil.

The Nigersaurus had a wide muzzle filled with more than 500 teeth: 68 columns in the upper jaws and 60 columns in the lower jaws. The front teeth would be worn out in less than a month and replaced, making the Nigersaurus the fastest teeth-replacing dinosaur.

The Utahraptor could grow up to 7 meters (20 feet) long and weigh almost a ton. A close relative of the Velociraptor, this dinosaur was a fierce predator. Like other dromaeosaurids, it had a huge, blade-like claw on its second toe. With this 20 centimeter talon, it is believed that the Utahraptor could make a deep cut 5 to 6 feet long with one swipe, enabling it to kill dinosaurs much larger than itself.

Although there have probably been dinosaur discoveries dating back thousands of years -- there are, for instance, references to "dragon bones" found in ancient China -- the first documented dinosaur discovery took place in 1676 when a jawbone and teeth were unearthed in Oxford, England. In 1824, famed paleontologist William Buckland (1784-1856) finally named this first dinosaur Megalosaurus. Megalosaurus was a large meat-eater that stood up to 9 meters (30 feet) tall and weighed about 1 ton.