A: Yes, dinosaurs were reptiles; your argument is wrong in many ways. Body temperature regulation is not part of the definition of reptiles (except in very old books and popular culture). For information on reptiles, click here. In addition, many thousands of fossilized dinosaur eggs have been found all around the world. Also, many modern-day reptiles give birth to live young (like some snakes).

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A: Anatosaurus is probably a juvenile example of Edmontosaurus. For information on Edmontosaurus, click here.

A: For a list of dinosaurs museums in the USA, click here. Some of the best are the Carnegie (Pittsburgh, PA), the National Museum of Natural History - Smithsonian Institution's Dinosaurs (Washington, D.C.), and the American Museum of Natural History (NY, NY).

A: The fastest dinosaurs were probably the long-legged, light-weight, hollow-boned ornithomimids (dinosaurs like Gallimimus and Ornithomimus).

A: Alamosaurus was a lizard-hipped dinosaur (a saurischian). For more information on Alamosaurus, click here.

A: For more information on Komodo dragons, click here.

A: Alamosaurus means Alamo lizard; it was named for Ojo Alamo (a trading post in New Mexico), where it was found. For more information on Alamosaurus, click here.

A: Stegosaurs were a group (family) of quadrupedal, plant-eating, ornithischian dinosaurs with two rows of armored plates along their backs and tail spikes. They lived from the Mid-Jurassic to the early Cretaceous. Dacentrus, Kentrosaurus and Stegosaurus were stegosaurs

A: Iguanodont means "iguana tooth." These dinosaurs were given that name because their teeth resembles those of modern-day iguanas. For information on Iguanodon, click here.

A: If they're unknown, we don't know about them.

A: No Stegosaurus eggs have been found, so no one knows how many eggs were laid at one time. I've never seen an estimate of Stegosaurus' life span.

A: Diplodocus lived during the late Jurassic Period, from 155-145 million years ago. For more information on Diplodocus, click here.

A: T. rex was bigger than Megalosaurus.

A: No. The last of the dinosaurs went extinct about 65 million years ago. The woolly mammoth went extinct about 11,000 years ago.

A: No dinosaurs have been found in Virginia. For a list of dinosaurs found state by state in the USA, click here.

A: Yes, most of the bird genera that ever lived went extinct long before humans appeared (this is true for most life forms).

A: Barosaurus was named by Othniel Marsh in 1980. I don't know who found the fossil - it was probably someone who was working on his fossil-hunting team (these people were rarely given proper credit).

A: T. rex

A: Megalodon was probably the largest shark. Since only fossil teeth are found from ancient sharks (they have no bones, only cartilage, which does not fossilize well).

A: Tyrannosaurus rex and Triceratops horridus.

A: For a page on Stegosaurus, click here.

A: No Pachycephalosaurus nests or eggs have been found so it isn't known how many eggs were laid (or if they were laid in a nest or if there was any parental care). I've never seen any estimates for the life span of Pachycephalosaurus.

A: Parasaurolophus has been foundin Alberta, Canada and Montana and New Mexico, USA (and perhaps Utah). I haven't heard of any found in Alaska.

Pachycephalosaurs and ceratopsians (the clade Marginocephalia, Sereno, 1986) are classified closely together because these two ornithischians share a lot of skeletal characteristics, including a a distinctive skull structure (a slight shelf or bony frill on the back of the skull), a unique palate (part of the mouth) and a short pubis (part of the hip).

A: Trachodon is only known from a few teeth - its life span isn't known.

A: The dinosaurs evolved during the Triassic period. During this time, the weather was warmer, the sea levels were higher (because there was no polar ice), the Earth's continents were jammed into one supercontinent called Pangaea, and much of the land of Earth was inland and desert-like.

A: Oddly enough, Komodo dragons live on the island of Komodo and on nearby islands (in Indonesia). For more information on Komodo dragons, click here.

A: For information on Xiaosaurus, click here.

A: No.

A: I didn't say they were closer to reptiles, I said they WERE reptiles - and if you redefine reptiles to be a clade (changing the traditional definition of reptile that 99 percent of all people accept), the clade of reptiles of course includes the birds. I've added a rejoiner to the short answer I gave.

A: Yes, some dinosaurs, like Ornithomimus and Oviraptor, were onmivores (eating both plants and animals). For more information on dinosaur diets, click here.

A: During the Cretaceous period, there were a lot of other animals, including other reptiles (like pterosaurs, ichthyosaurs, and mosasaurs), early mammals, many invertebrates (including insects, arachnids, worms, sponges, trilobites, ammonites, corals, etc.), fish (including sharks), and many more.

A: Megalodon probably looked a lot like the Great White Shark, but was much bigger and perhaps more streamlined. For information on Megalodon, click here.

A: Most were plant eaters. For a list of all the known dinosaur genera, click here - the plant-eaters are in green and the meat-eaters are in red.

A: Dinosaurs were reptiles (reptiles as a clade includes the birds, also).

A: Yes, for a page of dinosaur printouts, click here.

A: For a page on Australian dinosaurs, click here.

A: Lesthosaurus was a very early dinosaur - it lived during the Triassic period. For more information on Lesothosaurus, click here.

A: For most dinosaurs, including Spinosaurus, that information is not known. Only a few, incomplete Spinosaurus fossils have been found, and that tells you nothing about how (or if) they cared for their young. As to how they fought and caught their food, it's a matter of conjecture. They probably used their sharp teeth and clawed arms (and/or legs).

A: For Brachiosaurus, click here. For Ankylosaurus, click here. For Plesioosaurus, click here.

A: Different dinosaurs had different number of digits on their hands (or front legs). The number of digits varied from two to five. For example, T. rex had two functional fingers on each hand, Allosaurus and Coelophysis had three fingers on each hand, Ceratosaurus had four fingers on each hand, and Ankylosaurus had five fingers on each hand.

A: 1. Most were plant eaters. For a list of all the known dinosaur genera, click here - the plant-eaters are in green and the meat-eaters are in red.

2. Dinosaurs lived during the Mesozoic Era from about 230 million years ago until 65 million years ago. The weather varies then, but was generally warmer than it is now.

3. See the frequently-asked questions listed above.

4. No, not all the dinosaurs were big. Some were the size of chickens (like Compsognathus) or even smaller.

A: Piatnitzkysaurus (a meat-eating dinosaur) is known from 2 fragmentary skeletons.

A: Megalosaurus fossils have been found in England. This huge meat-eater probably had no enemies (as a healthy adult). For more information on Megalosaurus, click here\.

A: A paleontologist is a scientist who studies paleontology, learning about the forms of life that existed in former geologic periods, chiefly by studying fossils.

A: There were many more herbivores (plant-eaters). For a page on why this is so, and dinosaur diets in general, click here.

A: For a page on T. rex's evolution, click here.

A: For a page on how fossils form, click here.

A: Many dinosaurs have been found in Utah, including: Alamosaurus, Allosaurus, Amblydactylus, Apatosaurus, Barosaurus, Camarasaurus, Camptosaurus, Cedarosaurus, Coelophysis, Diplodocus, Dryosaurus, Dystrophaeus, Iguanodon, Iliosuchus, Marshosaurus, Nanosaurus, Nedcolbertia, Ornitholestes, Ornithomimus, Othnielia, Parasaurolophus, Rioarribasaurus, Stegosaurus, Stokesosaurus, Tenontosaurus, Torosaurus, Utahraptor.

For a list of dinosaurs found state by state in the USA, click here.

A: The dinosaurs lived during the Mesozoic Era

A: Because they couldn't adapt to changes (like changes in the climate, new competition from other animals, etc.).

A: Giganotosaurus stood 12 feet tall (from the ground to the hips). THe height to the head depends on the animal's posture. For more information on Giganotosaurus, click here.

A: No. For a list of dinosaurs found state by state in the USA, click here.

A: Barbourofelis was a mammal (an early cat), not a dinosaur. For information on Barbourofelis, click here.

A: No dinosaurs have been found in Viriginia. For a list of dinosaurs found state by state in the USA, click here.

A: Yes, the original Brontosuarus (now called Apatosaurus) had the wrong head put on it. The original Brontosaurus fossil, found in 1879, lacked a skull (as many fossils do). Othniel Marsh added a skull found miles away (this skull did not belong to the Brontosaurus, but to a Camarasaurus). In 1900, Henry Osborn assembled another skull-less Brontosaurus at the American Museum of Natural History in New York City, adding a cast of Marsh's skull. In 1915, Earl Douglass of the Carnegie Museum found a Brontosaurus fossil that included the skull, but because of Osborn's influence, the Carnegie displayed the fossil skull-less. When Douglas died in 1932, the incorrect skull was put on display! It wasn't until 1975 that the proper skull was mounted on Brontosaurus/Apatosaurus fossils in museums.

For more information on Apatosaurus, click here.

A: In many, many ways. One of the most obvious is when you find fossil marine fish on an inland mountain top. This indicates that the area was once under a sea oe ocean, and that the surrounding land has changed enormously over time.

A: Many dinosaurs (like Triceratops and Ceratosaurus) had horns made of bone. They may have also had layers of horn on top of the bone, but horn (made from a protein called keratin) does not fossilize well.

A: The largest land animal that has teeth teeth is the elephant. The largest animal in the water with teeth is the sperm whale.

A: Trachodon is only known from a few fossilized teeth - a reasonable weigh estimate would be impossible. For information on Trachodon, click here.

A: The dinosaurs didn't evolve until after the Permian period ended (dinos evolved during the Triassic period, about 230 million years ago).

A: No one knows, but this is one of the most puzzling questions in paleontology.

A: Some dinosaurs that had a sail on the back included Spinosaurus, Ouranosaurus and Acrocanthosaurus.

A: Click here for a page on Jurassic period plants.

A: For early Jurassic dinosuars, click here. For middle Jurassic dinosuars, click here.For late Jurassic dinosuars, click here.

A: Their habitats varied tremendously, and includied desert-like areas, warm forests, cool areas, and others.

A: All of them.

A: For information on Tanystropheus (a long-necked reptile, not a dinosaur), click here.

A: For a page on Nodosaurus, click here.

A: The pterosaurs (allso called pterosauria) were an order of flying reptiles that included genera like Pterodactylus, Pteranodon, Quetzalcoatlus, and Dimorphodon. There is no genus called Pterosaurus (but some people mistakenly call the pterosaurs by this name). For information on pterosaurs, click here.

A: Creta is the Latin word for chalk. The Cretaceous period is named for chalky rock from southeastern England that was the first Cretaceous period sediment studied.

A: There were probably no predators who would attack a healthy, adult Supersaurus.

A: Archaeopteryx probably laid eggs, but none have been found yet.

A: Pangaea is the name given to the supercontinent that existed during the early Mesozoic Era (roughly 200 million years ago). FOr more information on Pangaea, click here.

A: All the meat-eating dinosaurs (called theropod) walked on two legs. Some plant-eaters walked on two legs (like Hypsilophodon and Dryosaurus) and some walked on four (like Triceratops, Stegosaurus, Brachiosaurus, and Apatosaurus.

A: Armor. For more information on Ankylosaurus, click here.

A: No, they're quite different. Megalodon was a huge, ancient shark. Megalosaurus was the first dinosaur fossil discovered (in England in 1676). It was also the first dinosaur given a scientific name - by William Buckland in 1824.

A: Click here.