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Tree of Life
Plant Flower, Tree
Invertebrate 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
These are organized by a classification scheme developed exclusively for Cosma. More…
Dinosaur : any of a group (Dinosauria) of extinct often very large chiefly terrestrial carnivorous or herbivorous reptiles of the Mesozoic era — Webster
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
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Dinosaurs News -- ScienceDaily All about dinosaurs. Read about dinosaur discoveries including gigantic meat-eating dinosaurs, earliest dinosaurs and more. Dinosaur pictures and articles.
- Bird brains left other dinosaurs behindon July 30, 2021 at 8:54 pm
Research on a newly discovered bird fossil found that a unique brain shape may be why the ancestors of living birds survived the mass extinction that claimed all other known dinosaurs.
- Sharp size reduction in dinosaurs that changed...on July 6, 2021 at 3:53 pm
Dinosaurs were generally huge, but a new study of the unusual alvarezsaurs show that they reduced in size about 100 million years ago when they became specialized ant-eaters.
- New fossil sheds light on evolution of how...on July 6, 2021 at 3:53 pm
An international team of scientists has used high-powered X-rays at the European Synchrotron to show how an extinct South African 200-million-year-old dinosaur, Heterodontosaurus tucki, breathed.
- Digging into the molecules of fossilized dinosaur...on June 30, 2021 at 4:54 pm
Dinosaurs roamed the Earth more than 65 million years ago, and paleontologists and amateur fossil hunters are still unearthing traces of them today. The minerals in fossilized eggs and shell fragments provide snapshots into these creatures' early lives, as well as their fossilization processes. Now, researchers have analyzed the molecular makeup of fossilized dinosaur eggshells from Mexico, finding nine amino acids and evidence of ancient protein structures.
- Dinosaurs were in decline before the endon June 29, 2021 at 5:05 pm
The death of the dinosaurs 66 million years ago was caused by the impact of a huge asteroid on the Earth. However, paleontologists have continued to debate whether they were already in decline or not before the impact. Scientists now show that they were already in decline for as much as ten million years before the final death blow.
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.
- Venom has contributed to the species diversity of...on August 5, 2021 at 6:34 pm
The extraordinary diversity of insects and fishes, the most species-rich invertebrate and vertebrate groups in the animal kingdom, is partly due to the origin of venom, a new study of their evolution has revealed.
- Endangered Tuataras' super-speedy sperm could...on August 4, 2021 at 11:50 am
New Zealand's endemic tuatara (Sphenodon punctatus) are the sole survivors of an ancient reptile order called Rhynchocephalia. Once widespread across New Zealand, tuatara survive in only a fraction of their historic range, on small offshore islands and in fenced eco-sanctuaries.
- Two new genera and species of conifers from upper...on August 3, 2021 at 3:31 pm
Illustrations depicting the dinosaur era—whether in books or movies—are often accompanied by lush greenery. During the Cretaceous period, the trees commonly dominating a wide range of Earth's terrestrial environments were conifers—similar to the pines, spruces, cypresses and cedars that populate the earth today. These conifers played a key role in ecosystems, providing nourishment, nutrients, and habitat for a range of prehistoric creatures.
- Simulating 195 million years of global climate in...on August 2, 2021 at 2:07 pm
The Mesozoic, which stretched from about 252 million to 66 million years ago, was a pivotal period in Earth's history. In addition to being the age of the dinosaurs, it was when the supercontinent Pangaea began to separate into the fragmented continents we're familiar with today. Together with elevated levels of carbon dioxide and the brightening Sun, tectonic changes influenced the global climate, producing warm and humid greenhouse conditions. A detailed understanding of the factors that […]
- Bird brains left other dinosaurs behindon July 30, 2021 at 9:12 pm
Today, being "birdbrained" means forgetting where you left your keys or wallet. But 66 million years ago, it may have meant the difference between life and death—and may help explain why birds are the only dinosaurs left on Earth.