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A: Click here.
A: Megalodon was a huge, ancient shark. For information on Megalodon, click here.
A: Diplodocus. For information on Diplodocus, click here.
A: Click here to learn about fossil dating.
A: Dimetrodon is often called a "mammal-like reptile", but it was neithera mammal nor a reptile. It was a pelycosaur, the group of animals that eventually led to the mammals. Yes, it laid eggs. For more information on Dimetrodon, click here.
A: Dinichthys were a family of ancient armored fish that included Dunkleosteus (the largest memeber of that family). For information on Dunkleosteus, click here.
A: Brontosaurus is now called Apatosaurus. For information on Apatosaurus, click here.
A: It varied quite a bit. During the early Mesozoic Era (the Triassic period), the land was generally hot and dry. As Pangaea began splitting apart (during the Jurassic period), the range of weather conditions increased. Equatorial areas were hot, but areas near the poles were cold.
A: It's called Pangaea.
A: You're reffering to a plesiosaur, probably Elasmosaurus (which wasn't a dinosaur, but was huge and lived about the same time as some of the dinosaurs).
A: Tyrannosaurus rex was up to 40 feet (12.4 m) long, about 15 to 20 feet (4.6 to 6 m) tall. For more information on T. rex, click here.
A: About 1,000 genera have been discovered so far, but there were likely many more than this.
A: It was named for Queen Victoria (1819-1901).
A: None. In the move Jurassic Park, they had Dilophosaurus spit, but there is no factual basis for this. For information on Dilophosaurus, click here.
A: Paleontologists.
A: No one knows. It would depend on a lot of things, like the animal's metabolic rate, how much nutrition it could extract from its food, etc. For information on Apatosaurus, click here.
A: Spinosaurus, like other dinosaurs, hatched from eggs. Neither the incubations period nor the time for the hatchling to reach maturity is known. For information on Spinosaurus, click here.
A: Brontosaurus is now called Apatosaurus. 1. Healthy adult Apatosaurus' probably had no predators. 2. It may have congregated in herds (but no bonesbeds of Apatosaurs have been found). 3. No one knows anything about its mating practices. For more information on Apatosaurus, click here.
A: The bathtub simile is just to give an idea of the huge size; the prints were not rectangular. For a photo of a sauropod footprint from another site, click here.
A: For information on Centrosaurus, click here.
A: Albertosaurus, Ankylosaur (an unknown genus), Edmontosaurus, Pachycephalosaurus, Pachyrhinosaurus, Saurornitholestes, Thescelosaurus, Troödon have been found in Alaska. (For a page on which dinsaurs have been found in which part of the world, click here.)
A: Yes, there were some, like Oviraptor and Ornithomimus. For more information on dinosaur diets, click here.
A: Tyrannosaurus rex was up to 40 feet (12.4 m) long, about 15 to 20 feet (4.6 to 6 m) tall. For more information on T. rex, click here.
A: For a recent discovery that relates to this, click here.
A: The meat-eating dinosaurs (called theropods) all walked on two legs (they were bipeds).
A: For a list of middle Jurassic dinosaurs, click here.
A: For interactive dinosaur puzzles, click here. For a simpler dinosaur game, click here.
A: They were reptiles.
A: For the classification of Pteranodon, click here. It was a carnivore and a biped.
A: Various types of dinosuars lived from about 230 million years ago until about 65 million yeasr ago. Dinosuars have been found on all continents. For lists of which dinosaurs were found on which continent, click here.
A: About 1,000 genera have been discovered so far, but there were likely many more than this.
A: The earliest-known dinosaurs date from about 230 million years ago, during the Triassic period. For more information on the earliest-known dinosaur, click here.
A: I don't have much on that theory because it doesn't really make sense. When the dinosaurs went extinct, they weren't the only group to go extinct, so did many other animals (includng many amrine organisms) and many plants. Although an epidemic can wipe out a species or two, there are no disease organisms that can affect a large portion of the plant and animal species on Earth. Although disease may have affected some organisms, it was not the cause of a mass extinction.
A: For some drawings of dinosaur teeth, click here. For a drawing of a claw, click here.
A: See the frequently asked questions above.
A: Yes, all animals interact with other animals. WIth the species they mate. Outside the species they ate many other animals, and were eaten by yet others.
A: Click here.
A: All dinosaurs, including Stegosaurus had a spinal cord and many vertebrae. For more information on Stegosaurus, click here.
A: For information on many famous paleontologists, click here.
A: I've never heard of it, but it certainly sounds like a good idea. If anyone out there has heard about it, please let me know.
A: Some dinosaurs that were just named this year include: Bambiraptor, Byronosaurus, Charonosaurus, Chuanjiesaurus, Nanyangosaurus, Nqwebasaurus, Pyroraptor, and Tendaguria.
A: A mass extinction, usually referred to as the K-T extinction. It happened 65 million years ago. For more information on the K-T extinction, click here.
A: About 65 million years ago.
A: No one knows for sure. For more on this debate, click here.
A: The birds. For more information, click here.
A: Huge batches of dinosaur eggs have been found i many countries, including France, Spain, Mongolia, China, Argentina, and India. For more information on dinosaur eggs, click here.
The blue whale is more massive than any of the dinosaurs.
A: Brontosaurus is now called Apatosaurus. This giant dinosaur lived during the Jurassic period. For more information on Apatosaurus, click here.
A: The crust is the outer surface of the planet. For more information, click here.
A: All the dinosaurs are known commonly by their scientific name (usually the genus). The type species of Pachycephalosaurus is P. wyomingensis. The genus name of Pachycephalosaurus is Pachycephalosaurus. The pachycephalosaurs were a group of dinosaurs that included Pachycephalosaurus, Stegoceras, and other thick-skulled plant-eating dinosaurs. For information on Pachycephalosaurus, click here.
A: Minmi was about 10 feet (3 m) long. For more information on Minmi, click here.
A: Carnivore.
A: Sir Richard Owen. For more information, click here.
A: Click here to go to the Dinosaur Dictionary. For a page on Megalosaurus, click here.
A: Only a few dinosaurs were thought to be herding animals (because their fossils were found together in large groups, like Maiasaura and Hypsilophodon). Most dinosaurs have been found alone, but that doesn't necessarily mean that they were solitary animals. A few plant-eating dinosuars that were found alone include Janenschia and Minmi.
A: The smallest known adult dinosaur was about the size of a chicken (Compsognathus).
A: No one knows. For more information, see the frequently asked questions above.
A: The earliest-known dinosaur dates from about 230 million years ago, during the Triassic period.
A: Ceratosaurus fossils have been found in Colorado and Utah (USA) and in Tanzania, Africa. For more in formation on Ceratosaurus, click here.
A: The American paleontologist Othniel C. Marsh described and named Apatosaurus in 1877. A few years later, in 1879, he described and named another fossil, Brontosaurus. It turned out that the two dinosaurs were actually two species of the same genus. The earlier scientific name, Apatosaurus, was adopted. For more information on Apatosaurus, click here.
A: T. rex was a predator of Triceratops.
A: No one knows the exact life span of T. rex. Since it was a large animal, it probaly has a long life span (this is based on modern-day animals having long life spans as compared to small animals). For more information on dinosaur life spans, click here. For more information on T. rex, click here.
A: Click here for information on the Alvarex asteroid theory.
A: No one knows why some of the dinosaur grew to be so large (and why we don't have enormous land animals now); this is one of the many unanswered and very interesting questions about dinosaurs.
A: Roughly 200, but it varied from species to species.
A: Seismosaurus means "Earthquake lizard" or "Quake lizard." For more information on Seismosaurus, click here.
A: The dinosaurs lived during the Mesozoic Era.
A: It's a fossil that lived during the Cambrian period, 540 to 500 million years ago.
A: The Devonian Period is sometimes called the "Age of Fishes" because fish became adundant and diverse during this time, 408 to 360 million years ago. Land plants were also doing very well. The first amphibians appeared during the Devonian. The first tetrapods appeared toward the end of this period. The first sharks, bony fish, and ammonoids also evolved. Coral reefs, brachiopods, and crinoids were abundant. New insects, like springtails, appeared. Towards the end of this period was a mass extinction (345 mya) that wiped out 30% of all animal families); it was probably caused by glaciation or meteorite impact.
A: Astrodon, which is known only from teeth. The only three found in Maryland are: Astrodon (1859), Pleurocoelus (1888), and Priconodon (1888).
A: Yes, Xenotarsosaurus, Xiaosaurus, Xuanhanosaurus, and Xuanhuasaurus.
A: There is an adult human being pictured with the dinosaur( to scale) on many of our printouts, including T. rex, Stegosaurus, and Diplodocus, etc. Using these printouts, you can show your students how they would be eye-level with the knees of an Allosaurus, and not even be up to the knees of a Diplodocus. You can show how an adult human is smaller than the head of T. rex!
T. rex was about as long as a school bus (about 40 feet long) - an entire class of students could fit inside a Diplodocus. Allosaurus was just a bit smaller. The giant sauropods were much bigger than T. rex - the tail alone was as long as a school bus for many of these giants. For a printout with a dinosaur size comparison activity, click here. For a printout on dinosaur sizes, click here.
For a page on dinosaur sizes, click here. For a dinosaur size graphing activity, click here.
A: No Ultrasauros foot bones have been found, but the footprints would probably be about the size of a bathtub. Also, Ultasauros is a doubtful genus of dinosaur; it is probably a Supersaurus.
A: The heaviest dinosaurs all walked on four legs, and he lightest walked on two, but in the middle, it varied. As for height, two-legged dinosaurs varied in height from about a foot to about 50 feet tall, and four-legged dinosaurs varied from about 2 feet tall to about 50 feet tall (but many four-legged dinosaurs could also walk on two legs).
Q: Please tell me I need
help!
If a dinosaur caging costs $9.50 for a
ten-foot section, how much would the
dinosaur caging cost for just the length of
the cage?
from Patrick T.,
Gilmer,
Texas,
USA;
September 15, 2000
A: It depends on what type of dinosaur you had. Some dinosaurs were the size of chickens, others were bigger than a house.
A: No one knows what color the dinosars were. See the frequently asked questions above.
A: See the frequently asked questions above.
A: Alador was the dinosaur star of the recent Disney cartoon dinosaur movie. Alador was an Iguanodon, a plant-eating duck-billed dinosaur. For information on Iguanodon, click here.
Q: WHAT TYPE OF FOOD DO
THESE DIFFERENT DINOSAUS EAT
PACHYCEPHALOSAURUS
OVIRAPTORS
STEGOSAURS
ANKYLOSAUR
TRICERATOPS
TYRANNOSAURUS
PARASAUROLOPHUS
from KATHY A,
ADDISON,
TX,
USA;
September 14, 2000
A: Click on the name of the dinosaur to go to a page on it with information on its diet: Pachycephalosaurus, Oviraptor, Stegosaurus, Ankylosaurus, Triceratops, T. rex, Parasaurolophus.
A: Baryonyx is known to have eaten fish. For more informatin on Baryonyx, click here.
A: The genus is Deinonychus (the dinosaurs are commonly known by their genus name). It belongs to the class Archosauria (diapsids with socket-set teeth), order Saurischia (lizard-hipped dinosaurs), and family Dromaeosauridae (the so-called raptors). (NB Most paleontologists don't use Linnean classification - they use cladistics, a way of classifying organisms based on their evolutionary relationships.) For more information on dinosaur classification, click here.
A: It varied greatly among the different dinosaurs and across time. Some lived in forested areas, other lived in dryer areas; some lived in very warm areas, while others lived in cold areas.
A: It would depend on which dinosaur you had. Dinosaurs ranged in size from the size of a chicken to bigger than a house.
A: The kakapo is a bird close to extinction - there are fewer than 100 of these critically endangered birds in the wild. For some endangered species, click here. I can't think of a species that went extinct in the last 2 years (but there are probably many).
A: Stegosaurus means "roofed lizard" or "covered lizard." Stegosaurus reproduced by laying eggs, but no one knows how many eggs were laid at one time.
For more information on Stegosaurus, click here.
A: Yes. Megalodon is an extinct shark - the megamouth is a modern-day shark. For more information on Megalodon, click here.
A: All the dinosaurs are known by their scientific names. Stegosaurus is the scientific name for a genus of dinosaurs. For more information on Stegosaurus, click here.
A: The blue whale.
A: See the frequently asked questions above.
A: No one knows. For information on Allosaurus, click here.
A: For information on Megalodon, click here.
A: THere were many "raptors" including Velociraptor, Deinonychus, Utahraptor, etc. Utahraptor is the biggest know; it was about 20 feet long (6.5 m).
A: Lizards evolved long before Mastodons appeared.
A: Ammosaurus, Anchisaurus, Anomoepus, Chindesaurus, Coelophysis, Dilophosaurus, Eubrontes, Massospondylus, Navahopus, Revueltosaurus, Rioarribasaurus, Scutellosaurus, Segiosaurus, Sonorasaurus, Syntarsus have been found in Arizona.
A: For a page on some mammals that lived during the last Ice Age, click here.
A: Eoraptor had sharp teeth and claws on its arms and legs. For more information on Eoraptor, click here.
A: It varied depending on the location (and the time), but was generally warmer than it is now. For more information on the Mesozoic Era, click here.
A: Some of the earliest-known mammals include Eozostrodon, Jeholodens and Zalambdalestes. For more information on mammalian evolution, click here.
A: There were many more plant-eating dinosaurs than meat-eating dinosaurs. Triceratops had three horns on its head. The last of the dinosaurs went extinct about 65 million years ago.
A: Brachiosaurus is pronounced BRACK-ee-uh-SAWR-us. For information on Brachiosaurus, click here.
A: There's a lot of debate about this. Some biologists argue that flying begins as gliding (from trees) and evolves into powered flight. Other biologists argue that flying begins as leaping from the ground. For a good page on the topic, click here.
A: For a page on dinosaur life spans, click here.
A: Almost everything we know about dinosaurs is from their fossil remains. Their fossils tell us how big they were, how they walked (and how fast), what they ate, how smart they were, and when they lived (from the location of the fossils with respect to index fossils, or radio-isotope dated lava).
A: No one knows.
A: Click here. Or for a black-and-white diagram, click here.
A: For information on Megalodon, click here.
A: Stegosaurus was a plant-eating dinosaur that ate low-lying plants. For more infrormation on Stegosaurus, click here. For a page on the plants that lived during the Jurassic period, when Stegosaurus lived, click here.
A: This site is filled with sentences about dinosaurs. Star by reading the main page on dinosaurs.
A: Because they were unable adapt to a changing environment (like new predators, a loss of a food source, environmental changes, disease, etc.); their birth rate becomes lower than their death rate, leading eventually to extinction.
A: In 1998, some bird-like dinosaurs with rudimentary feathers, Protarchaeopteryx robusta and Caudipteryx zoui, were found in the Liaoning Province of China.
A: Click here for information on T, rex's diet.
A: The earliest-known dinosaurs were found on Madagacar. The last-known dinosaur is a duck-bill that survived the K-T extinction.
A: Yes, the climate affects all organisms, including Coelophysis.
A: The most widely accepted theory is the Alvarez Asteroid Theory; for other theories, click here.
A: Was the Tyranosaurus rex a hunter or a scavenger? - There is some debate about this; click here for details. If the T-rex was a hunter, how did it hunt it's prey? The answer is the same page as the answer to the last question. How do scientists know how the T-rex hunted? Mostly by look at how modern-day large, fast predators (like lions) hunt. Who discovered the T-rex? Where was the T-rex discovered? Barnum Brown. For more information, click here. How did the T-rex take care of it's young? No one knows if it card for its young at all. What kind of climate and/or habitat did the T-rex live in? Read the main page on T. rex. What other dinosaurs lived around the
T-rex? For other late Cretaceous dinosaurs, click here and go the section on North America.
A: There are about a thousand known genera.
A: For a list of all the known dinosaurs, click here.
A: Herbivores.
A: The trenches probably do not have enough food to sustain a large predator like Megalodon.
A: For a page on excavating fossils, click here.
A: Tolland Man is a well-preserved prehistoric corpse that was found in a peat bog in Denmark in the 1950's. He seems to have been strangled; it is theorized that his death was a human sacrifice.
A: Dinosaurs have been found on all seven continents. For a series of pages on where dinosaur fossils have been found, click here.
A: None.
A: The "raptors" (like Utahraptor, Deinonychus, and Velociraptor) were at the top of the food chain, and unless they were young or injured, they probably had no predators.
They lived during the Cretaceous period.
A: There were many different genera of duck-billed dinosaurs, and as a group they are called hadrosaurs. Some of the most commonly-known duck-bills are Parasaurolophus, Lambeosaurus, Corythosaurus, Edmontosaurus, Hadrosaurus, and Maiasaura
A: I think it's vertebrae.
A: No one knows. For what is known about T. rex, click here.
A: Dilophosaurus, but there is no evidence that it spat anything (this was just made up for the movie). For more information on Dilophosaurus, click here.
A: Mammoths and mastodons were early elephants. For more information on mammoths, click here.
A: Yes.
A: Yes, that's quite a remarkable find. For those of you who haven't heard about this very late duck-bill, click here.
A: Triassic period: Eoraptor, Plateosaurus; Jurassic period: Brachiosaurus, Stegosaurus; Cretaceous period: T. rex, Triceratops.
A: You don't; all you can do is guess. See question #1 above in the Frequently Asked Questions.
A: Diplodocus was longer and heavier. Diplodocus was about 90 feet (27 m) long and weighed roughly 10-20 tons; Triceratops was about 30 feet (9 m) long and weighed roughly 6-12 tons.
For more information on Diplodocus, click here. For more information on Triceratops, click here
Cockroaches similar to modern-day species are found in upper Carboniferous rock, roughly 300 million years old. Dinosaurs evolved much later, about 230 million years ago, during the Triassic period.
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