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    Dinosaur | Definition, Types, History, Names, & Facts | Britannica

    Feb 12, 2025 · dinosaur, (clade Dinosauria), the common name given to a group of reptiles, often very large, that first appeared roughly 245 million years ago (near the beginning of the Middle Triassic Epoch) and thrived worldwide for nearly 180 million years.

    Dinosaur - Evolution, Classification, Extinction | Britannica

    Feb 12, 2025 · Dinosaur - Evolution, Classification, Extinction: After dinosaurs were recognized as a new type of fossil animal, popular fascination with them reached a peak in the 1850s with the first attempts to reconstruct Iguanodon, Megalosaurus, and Hylaeosaurus.

    Classification of dinosaurs and theories for their extinction | Britannica

    dinosaur, Any of the extinct reptiles that were the dominant land animals during most of the Mesozoic Era (251–65.5 million years ago). The various species appeared at different times—with the first form likely appearing some 245 million years ago—and not all overlapped.

    dinosaur - Kids | Britannica Kids | Homework Help

    Dinosaurs were common during the Triassic, Jurassic, and Cretaceous geologic time periods. Those time periods lasted from 252 to 66 million years ago. Not all species, or types, of dinosaur lived at the same time. They also did not all become extinct at the same time. They died out gradually. Where did dinosaurs live?

    dinosaur - Students | Britannica Kids | Homework Help

    British paleontologist Richard Owen introduced the term Dinosauria in 1842. The name dinosaur comes from the Greek words deinos (“terrible” or “fearfully great”) and sauros (“reptile” or “lizard”). Scientists have discovered and named some 1,000 dinosaur species.

    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.

    Dinosaurs | Dinosaur | Definition, Types, History, Names, & Facts ...

    Dinosaur | Definition, Types, History, Names, & Facts | Britannica

    Dinosaur classification - Wikipedia

    Classification of dinosaurs. Dinosaur classification began in 1842 when Sir Richard Owen placed Iguanodon, Megalosaurus, and Hylaeosaurus in "a distinct tribe or suborder of Saurian Reptiles, for which I would propose the name of Dinosauria."

    Dinosaur - Reptiles, Extinction, Fossils | Britannica

    Feb 12, 2025 · Dinosaur - Reptiles, Extinction, Fossils: The chief difference between the two major groups of dinosaurs is in the configuration of the pelvis. The two dinosaurian orders were named Saurischia and Ornithischia in 1887.

    Dinosaur Names - American Museum of Natural History

    Dinosaur names are often made up of combinations of Greek and Latin root words that describe anatomical characteristics or how the animal might have behaved. Other dinosaur names might honor a person or denote where the fossil remains were discovered.