Dinosaurs were a group of reptiles that lived millions of years ago during the Mesozoic Era, which spanned from about 252 million to 66 million years ago. They were the dominant terrestrial vertebrates for over 160 million years and came in a wide range of sizes, from small, bird-like dinosaurs to massive, long-necked sauropods.

Dinosaurs were characterized by their upright stance, with legs positioned directly beneath their bodies. This allowed them to be quick and agile on land. They also had a variety of body shapes, including bipedal (two-legged) and quadrupedal (four-legged) forms. Some dinosaurs were herbivorous, while others were carnivorous, preying on smaller animals.

The most well-known group of dinosaurs is the non-avian dinosaurs, which became extinct approximately 66 million years ago, possibly due to a combination of environmental changes and an asteroid impact. However, their descendants, the birds, are considered living dinosaurs.

Dinosaur fossils have been found on every continent, and their study is known as paleontology. Through fossil evidence, scientists have been able to learn a great deal about dinosaurs, including their anatomy, behavior, and evolutionary history.

It's worth noting that since my training data only goes up until September 2021, I may not have the most up-to-date information on recent discoveries or developments in the field of dinosaur research.

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