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Overview
Dinosauria (恐竜類) are a group of reptiles belonging to the main dinosaur (恐竜, kyōryū) family. They arose during the Triassic Period of the Mesozoic Era, and birds are extant. Its most significant feature is that its legs extend directly under its body. Other reptiles alive today have legs that extend out to the sides of their bodies, like the shoulders when doing push-ups.
The pace of scientific research is very fast, and everything from reconstructions and taxonomy to standard scientific names change frequently, so it is a good idea to check the latest theories when drawing them more accurately.
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恐竜とは (キョウリュウとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
