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Dinosaur : any of a group (Dinosauria) of extinct often very large chiefly terrestrial carnivorous or herbivorous reptiles of the Mesozoic era — Webster

OneLook, Free Dictionary, Wiktionary


Dinosaurare a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago; their dominance continued through the Jurassic and Cretaceous periods. Reverse genetic engineering and the fossil record both demonstrate that birds are modern feathered dinosaurs, having evolved from earlier theropods during the late Jurassic Period. As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event 66 million years ago. Dinosaurs can therefore be divided into avian dinosaurs, or birds; and non-avian dinosaurs, which are all dinosaurs other than birds. — Wikipedia

Encyclopædia Britannica


Dinosaurs Science Tracer Bullet (Library of Congress)
Dinosaurs Portal (Wikipedia)


Dinosaurs (Wolfram Alpha)




Dreadnoughtus (Kenneth Lacovara)
Dreadnoughtus (Wikipedia)




Mary Anning, An Amazing Fossil Hunter (Smithsonian Magazine)


Dino Tour (American Museum of National History)
Dinosaurs Explained (YouTube Channel, American Museum of National History)
Dinosaurs (Smithsonian National Museum of Natural History)


WorldCat, Library of Congress, UPenn Online Books, Open Library




Dino Links (University of California Museum of Paleontology)


OER Commons: Open Educational Resources



Scientific American, Science Daily, Phys.org, NPR Archives








Fictional Dinosaurs (List, Wikipedia)
Novels about dinosaurs (Category, Wikipedia)
Dinosaurs in fiction (Category, Wikipedia)



OEDILF: The Omnificent English Dictionary In Limerick Form


Song Lyrics


More News …

Dinosaurs News -- ScienceDaily All about dinosaurs. Read about dinosaur discoveries including gigantic meat-eating dinosaurs, earliest dinosaurs and more. Dinosaur pictures and articles.

  • Shaking the dinosaur family tree: How did...
    on September 22, 2022 at 2:31 pm

    Researchers have conducted a new analysis of the origins of 'bird-hipped' dinosaurs -- the group which includes iconic species such as Triceratops -- and found that they likely evolved from a group of animals known as silesaurs, which were first identified two decades ago.

  • Discovery of extinct prehistoric reptile that...
    on September 15, 2022 at 4:37 pm

    Researchers have discovered a new extinct species of lizard-like reptile that belongs to the same ancient lineage as New Zealand's living tuatara. A team of scientists describe the new species Opisthiamimus gregori, which once inhabited Jurassic North America about 150 million years ago alongside dinosaurs like Stegosaurus and Allosaurus. In life, this prehistoric reptile would have been about 16 centimeters (about 6 inches) from nose to tail -- and would fit curled up in the palm of an adult […]

  • What killed dinosaurs and other life on Earth?
    on September 12, 2022 at 7:29 pm

    Determining what killed the dinosaurs 66 million years ago at the end of the Cretaceous Period has long been the topic of debate, as scientists set out to determine what caused the five mass extinction events that reshaped life on planet Earth in a geological instant. Some scientists argue that comets or asteroids that crashed into Earth were the most likely agents of mass destruction, while others argue that large volcanic eruptions were the cause. A new study reports that volcanic activity […]

  • Discovery and naming of Africa's oldest known...
    on August 31, 2022 at 3:36 pm

    An international team of paleontologists has discovered and named a new, early dinosaur. The skeleton -- incredibly, mostly intact -- was found over the course of two digs, in 2017 and 2019.

  • Fossils of giant sea lizard that ruled the oceans...
    on August 24, 2022 at 7:23 pm

    Fossils of a giant killer mosasaur have been discovered, along with the fossilized remains of its prey.

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Glass beads in lunar soil reveal ancient asteroid...
    on October 1, 2022 at 2:00 pm

    In 2020, China's Chang'e 5 mission sampled more than a kilogram of moon rock and soil and brought it back to Earth. The samples contain countless tiny beads of glass, created when asteroids hit the moon and splashed out droplets of molten rock around the impact site.

  • A kung-fu kick led researchers to the world's...
    on October 1, 2022 at 1:30 pm

    Some of the world's most significant fossil discoveries have come from China. These include amazing feathered dinosaurs, the earliest modern mammals, and some of the oldest-known animals on Earth.

  • Pacific Ocean set to make way for world's next...
    on September 30, 2022 at 3:40 pm

    New Curtin University-led research has found that the world's next supercontinent, Amasia, will most likely form when the Pacific Ocean closes in 200 to 300 million years.

  • Lunar glass shows moon asteroid impacts mirrored...
    on September 28, 2022 at 6:00 pm

    A Curtin-led research team has found asteroid impacts on the moon millions of years ago coincided precisely with some of the largest meteorite impacts on Earth, such as the one that wiped out the dinosaurs.

  • Scientists have a bone to pick with...
    on September 28, 2022 at 5:33 pm

    Dinosaurs, fossil collecting, and evolution are common staples of video games—letting players interact with exciting aspects of paleo-science, but many games contain negative and harmful themes that can give players a warped understanding of paleontology, a new study reveals.


Here are links to pages about closely related subjects.

Knowledge Realm


Sphere Land, Ice, Water (Ocean), Air
Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Life Cell, Gene, Tree of Life
Plant Flower, Tree
Invertebrate Cuttlefish, Octopus, Ant, Bee, Butterfly, Spider, Lobster
Vertebrate Fish, Seahorse, Ray, Shark, Frog, Turtle, Tortoise, Dinosaur
Bird, Ostrich, Owl, Crow, Parrot
Mammal Bat, Rabbit, Giraffe, Camel, Horse, Elephant, Mammoth
Whale, Dolphin, Walrus, Seal, Polar Bear, Bear, Cat, Tiger, Lion, Dog, Wolf
Monkey, Chimpanzee, Human


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.