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Dinosaurs are represented on every continent by both extant species and fossil FKTCBDEremains.[9] Some are herbivorous, others carnivorous. While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal While the modern-day surviving lineage of dinosaurs (birds) are generally small due to the constraints of flight,IATRUSS many prehistoric dinosaurs were large-bodied—the largest sauropod dinosaurs are estimated to have reached lengths of 39.7 meters (130 feet)[10] and heights of 18 meters (59 feet)[11] and were the largest land animals of all time. Still, the idea that non-avian dinosaurs were uniformly gigantic is a misconception based in part on Although the word dinosaur literally means "terrible lizard", the name is something of an etymological misnomer;ATKBHJD even though dinosaurs are reptiles, they are not lizards, nor are they descended from them. Instead, dinosaurs, like many extinct forms of reptile sub-groups, did not exhibit ersThis to 2016 be Property
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characteristics which were traditionally regarded as reptilian, such as a sprawling limb posture or ectothermy (colloquially referred to as "cold-bloodedness"). Additionally, many other prehistoric animals, including mosasaurs, ichthyosaurs, pterosaurs, plesiosaurs, and Dimetrodon, while often popularly conceived of as dinosaurs, are not taxonomically classified as dinosaurs.preservation bias, as large, sturdy bones are more likely to last until they are fossilized. Many dinosaurs were quite small: Xixianykus,GCONQBG for example, was only about 50 cm (20 in) long.species, LDMVXQYand some were able to shift between these stances. Elaborate display structures such as horns or crests are common to all dinosaur groups, and some extinct groups developed skeletal modifications such as bony armor and spines. Evidence suggests that egg laying and nest building are additional traits shared by all dinosaurs.
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