Dinosaur | Definition, Types, History, Names, & Facts | Britannica
3 天之前 · Dinosaur, the common name given to a group of reptiles, often very large, that first appeared roughly 245 million years ago and thrived worldwide for nearly 180 million years. Most died out by the end of the Cretaceous Period. Many lines of evidence show that one lineage evolved into birds about 155 million years ago.
Titanosaurs: 8 of the World's Biggest Dinosaurs | Britannica
In terms of mass, Earth’s largest mammal is the blue whale (Balaenoptera musculus).Weighing approximately 136 metric tons (150 tons) and growing to a length of more than 30 meters (98 feet), it is also the largest animal that ever lived. But growing conditions are different in the ocean.
Name That Dinosaur! Quiz | Britannica
Take this Science quiz at Encyclopaedia Britannica to test your knowledge of dinosaurs.
dinosaur - Kids | Britannica Kids | Homework Help
For more than 150 million years, many large and scary creatures walked on land. They were the dinosaurs. These lizardlike reptiles got the name dinosaur from Greek words that mean “terrible lizard.”. The last dinosaurs became extinct, or died out, about 65.5 million years ago.
Dinosaurs Portal | Britannica
Feathered dinosaur, any of a group of theropod (carnivorous) dinosaurs, including birds, that evolved feathers from a simple filamentous covering at least by the Late Jurassic Epoch (about 163.5 million...
What Happened to the Dinosaurs? | Britannica
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6 Awesome Dinosaur Species You Should Know | Britannica
Encyclopædia Britannica, Inc. Contrary to what Jurassic Park would have you believe, although they reached up to 1.8 meters (6 feet) in length, velociraptors weren’t much larger than a turkey, standing just under 0.6 meter (2 feet) in height. However, their trademark large sickle-shaped claws on their second toes and swift agile hunting still made them formidable predators.
Sue | Fossil, History, & Facts | Britannica
Sue, nickname for one of the most complete and best-preserved skeletons of Tyrannosaurus rex.The fossil was dated to approximately 67 million years ago. Measuring 12.8 metres (42 feet) long, Sue is among the largest known skeletons of T. rex.The specimen was found on August 12, 1990, on South Dakota’s Cheyenne River Sioux reservation, on a cattle ranch owned by …
dinosaurs at a glance - Kids | Britannica Kids | Homework Help
Dinosaurs were lizardlike reptiles that lived on Earth for more than 150 million years. The word dinosaur means “terrible lizard.” Remains or traces of dinosaurs were first discovered in the early 1800s. They show that dinosaurs ranged in size from being smaller than a chicken to being more than 10 times larger than the largest elephant.
Pterosaur | Flying Reptile, Fossil Order | Britannica
2025年1月11日 · pterosaur, any of the flying reptiles that flourished during all periods (Triassic, Jurassic, and Cretaceous) of the Mesozoic Era (252.2 million to 66 million years ago). Although pterosaurs are not dinosaurs, both are archosaurs, or “ruling reptiles,” a group to which birds and crocodiles also belong. Pterosaurs were not only the first reptiles capable of flight.