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dinosaur
Table of Contents
References & Edit History Quick Facts & Related Topics
Images, Videos & Interactives
dinosaurs to scale dinosaur phylogeny
Find out whether dinosaurs really had feathers
How were dinosaurs discovered?
Archaeopteryx: The holy grail of fossils
Dinosaur National Monument fossil
Learn about the discovery of dinosaur “Sue” and the competition between collectors
The origins of birds.
Silhouette of a bird with outstretched wings holding a "Hello, my name is ?" badge, next to a set of four large, weathered bones on a dark background.
For Students
dinosaur summary
Quizzes
Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
Animal Group Names
Lion (panthera leo)
Deadliest Animals Quiz
Young chimpanzee dressed in a shirt and sweater vest, scratching his head thinking. (primates)
Wild Words from the Animal Kingdom Vocabulary Quiz
Mute swan with cygnet. (birds)
Match the Baby Animal to Its Mama Quiz
Model of a molecule. Atom, Biology, Molecular Structure, Science, Science and Technology. Homepage 2010 arts and entertainment, history and society
Science Quiz
Related Questions
Read Next
Illustration of a group of Brachiosaurus dinosaurs in the water. Sauropod late Jurassic to early Cretaceous
Did Humans Live at the Same Time as Dinosaurs?
Tyrannosaurus Rex attacking two Struthiomimus dinosaurs.
Did Dinosaurs Really Have Feathers?
illustration of the walking titanosaurus, Patagotitan mayorum
Titanosaurs: 8 of the World's Biggest Dinosaurs
Three parasaurolophus stand on a rock beach. Pterasaurs fly over head and a small mammal watches the dinosaurs as they meander along the water's edge.
What Happened to the Dinosaurs?
Therizinosaurus, theropod, dinosaur
6 Awesome Dinosaur Species You Should Know
Discover
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Srinivasa Ramanujan, Indian mathematician and autodidact.
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dinosaur: Media

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Videos

Find out whether dinosaurs really had feathers
Learn more about what kinds of dinosaurs may have had feathers and when.
Video: Encyclopædia Britannica, Inc.
How were dinosaurs discovered?
Learn about the history of people discovering fossils and the coining of the term...
Video: Encyclopædia Britannica, Inc.
Archaeopteryx: The holy grail of fossils
Archaeopteryx is the earliest known dinosaur that's also a bird.
Video: Encyclopædia Britannica, Inc.
Learn about the discovery of dinosaur “Sue” and the competition between collectors
A discussion of the competition among collectors and museums for dinosaur bones,...
Video: Great Museums Television (A Britannica Publishing Partner)
How to identify new species with just one bone
Hell Creek was home to T. rex, Triceratops, and now…these...
Video: Encyclopædia Britannica, Inc.
Discover the differences between Louis Dollo's former reconstruction and David Norman's current reconstruction of Iguanodon
Former reconstruction of Iguanodon by Louis Dollo (1870s), followed by current...
Video: Encyclopædia Britannica, Inc.
How are birds and dinosaurs related?
If some dinosaurs had feathers, does that make them birds?
Video: Encyclopædia Britannica, Inc.
Why don't birds have teeth?
Birds descended from dinosaurs, but they don't have their ancestors' bite.
Video: Encyclopædia Britannica, Inc.
How did tyrannosaurs walk?
Biomechanical reconstruction of a tyrannosaur in motion, showing skeletal structure.
Video: Encyclopædia Britannica, Inc.
Watch Earth's continents move, from 650 million years ago to 250 million years in the future
A time-lapse representation of Earth changing through geologic time, from the late...
Video: Adapted from C.R. Scotese, The University of Texas at Arlington
What did ancient animals REALLY eat?
Findings about a small bird have scientists rethinking dino diets.
Video: Encyclopædia Britannica, Inc.
Take a trip to Australia's Dinosaur Trail in Queensland, including the towns of Richmond, Hughenden, and Winton
A trip along the Dinosaur Trail in central Queensland, Australia. Stops include Richmond,...
Video: © Fun Travel TV (A Britannica Publishing Partner)
How did dinosaurs go extinct?
John Rafferty, associate editor of Earth sciences of Encyclopædia Britannica,...
Video: Encyclopædia Britannica, Inc.

Images

dinosaurs to scale
A selection of dinosaurs grouped by the geologic interval in which they lived.
Encyclopædia Britannica, Inc.
dinosaur phylogeny
Dinosaur phylogeny.
Courtesy of Paul C. Sereno (1997), University of Chicago
Dinosaur National Monument
Scientists excavating dinosaur fossils from a quarry wall in Dinosaur National Monument,...
National Park Service
fossil
Fossil of a dinosaur in the Lufengosaurus genus lying where it was unearthed...
Robert Reisz
Plateosaurus
Plateosaurus, late Triassic dinosaur. A large herbivore, it may have reared...
Encyclopædia Britannica, Inc.
Iguanodon
Iguanodon, an early Cretaceous dinosaur, was a massive herbivore with a...
Encyclopædia Britannica, Inc.
Compsognathus
Compsognathus, late Jurassic dinosaur. It was a swift and agile predator...
Encyclopædia Britannica, Inc.
Troodon
Troodon, late Cretaceous dinosaur. This birdlike predator had large keen...
Encyclopædia Britannica, Inc.
Coelophysis
Coelophysis, a late Triassic dinosaur, was among the earliest dinosaurs...
Encyclopædia Britannica, Inc.
Eoraptor
Eoraptor, late Triassic dinosaur. A more primitive contemporary of Herrerasaurus,...
Encyclopædia Britannica, Inc.
Major dinosaur fossil sites
Distributed on all continents, more than 1,000 different sites containing dinosaur...
Encyclopædia Britannica, Inc.
computer reconstruction
Functional anatomic studies have revealed that the upright, tail-dragging posture...
Encyclopædia Britannica, Inc.
Luis and Walter Alvarez
Physicist Luis Alvarez (left) and his geologist son Walter standing next to a clay...
Lawrence Berkeley National Laboratory
structural relationships
Structural relationship between Troodon (a dinosaur) and Archaeopteryx...
Encyclopædia Britannica, Inc.
Hesperornis
Hesperornis skeleton.
Courtesy of the American Museum of Natural History, New York
Ceratosaurus and Psittacosaurus
Differences in dentition between plant-eating and meat-eating dinosaurs.
Encyclopædia Britannica, Inc.
Shantungosaurus
Shantungosaurus, a late Cretaceous dinosaur and close relative of Anatosaurus,...
Encyclopædia Britannica, Inc.
Brachiosaurus
Brachiosaurus, late Jurassic to early Cretaceous dinosaur. A massive herbivore...
Encyclopædia Britannica, Inc.
Ceratosaurus
Ceratosaurus, a late Jurassic dinosaur, was a large predator with bladelike...
Encyclopædia Britannica, Inc.
Deinonychus
Deinonychus, an early Cretaceous dinosaur, was a formidable predator capable...
Encyclopædia Britannica, Inc.
fossilized eggs
Eggs once thought to have belonged to Protoceratops are now known to be...
Encyclopædia Britannica, Inc.
Ornithomimus
Ornithomimus, a late Cretaceous dinosaur, was a swift omnivore with a small...
Encyclopædia Britannica, Inc.
Apatosaurus
Apatosaurus, a late Jurassic dinosaur, was a massive herbivore that weighed...
Encyclopædia Britannica, Inc.
Barosaurus
A Barosaurus skeleton on exhibit at the American Museum of Natural History,...
© Index Open
selected taxonomy
Dinosaurs are classified into subgroups on the basis of major skeletal features.
Encyclopædia Britannica, Inc.
dinosaur pelvis structure
Pelvis structure in saurischians and ornithischians.
Encyclopædia Britannica, Inc.
dinosaur pelvis types
Types of dinosaur pelvis.
Encyclopædia Britannica, Inc.
Allosaurus
Allosaurus, a late Jurassic dinosaur, was a large fearsome predator with...
Encyclopædia Britannica, Inc.
Herrerasaurus
Herrerasaurus, a late Triassic dinosaur, was one of the earliest known dinosaurs....
Encyclopædia Britannica, Inc.
Tyrannosaurus
If Tyrannosaurus had stood upright, it would have been more than 6.5...
Encyclopædia Britannica, Inc.
Velociraptor
(Top) Artist's re-creation of Velociraptor and (bottom) reconstruction of...
Encyclopædia Britannica, Inc.
Lesothosaurus
Lesothosaurus, early Jurassic dinosaur. This tiny herbivore was lightly...
Encyclopædia Britannica, Inc.
Hypsilophodon
Hypsilophodon, early Cretaceous dinosaur. This herbivore was small and fast...
Encyclopædia Britannica, Inc.
Parasaurolophus
Skull of the hadrosaur Parasaurolophus.
Encyclopædia Britannica, Inc.
Stegoceras
Skull of the pachycephalosaur Stegoceras.
Encyclopædia Britannica, Inc.
Triceratops
Triceratops, a late Cretaceous dinosaur, was a massive herbivore with a...
Encyclopædia Britannica, Inc.
Psittacosaurus
The forward region of the skull of Psittacosaurus was shaped very much like...
Encyclopædia Britannica, Inc.
Protoceratops
Protoceratops, late Cretaceous dinosaur. This herbivore was solidly built...
Encyclopædia Britannica, Inc.
Stegosaurus
Stegosaurus, late Jurassic dinosaur. The largest known plated dinosaur,...
Encyclopædia Britannica, Inc.
Euoplocephalus
Euoplocephalus, a late Cretaceous dinosaur, was a broad-beaked herbivore...
Encyclopædia Britannica, Inc.
Argentinosaurus
A reconstruction of Argentinosaurus, measuring about 40 metres (131 feet)...
William Irvin Sellers, Lee Margetts, Rodolfo Aníbal Coria, Phillip Lars Manning
Dinosaur fossils found in Alberta, Canada.
AbleStock/Thinkstock
fossil
Fossilized footprint of an unidentified dinosaur.
© Getty Images
Dreadnoughtus
Dreadnoughtus, the largest dinosaur whose size can be calculated reliably....
Encyclopædia Britannica, Inc.
Skeletons of an ornithischian dinosaur (Stegosaurus) and a saurischian dinosaur...
© Merriam-Webster Inc.

Interactives

The origins of birds.
Join the search for how birds evolved from Mesozoic-era dinosaurs in our interactive.
Encyclopædia Britannica, Inc.
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