Hadrosaur (Duck-billed Dragon)

Japanese: カモハシ竜(鴨嘴竜) - かもはしりゅう（英語表記）hadrosaur

A representative group of dinosaurs belonging to the Ornithopoda suborder of the Ornithischia order of reptiles, with around 31 known species in 2 families, 23 genera. They are called duckbills because the shape of their skulls, especially their snouts, resembles a duck's beak. They were the first dinosaurs to be discovered in North America, and flourished mainly in North America and Asia during the Late Cretaceous period. They were herbivorous and bipedal, with many large specimens exceeding 10m in length. They are also famous for being dinosaurs that flourished through diversification of form. Adaptation mechanisms can be seen especially in the skull, jaws, and teeth.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

爬虫類鳥盤目の鳥脚亜目Ornithopodaに属する代表的な恐竜の一群で，2科23属31種ほどが知られている。頭骨，とくに吻（ふん）部の形態からアヒルのくちばしに似た恐竜という意味でカモハシ竜と呼ぶ。北アメリカで発見された最初の恐竜で，白亜紀後期に北アメリカとアジアを中心に栄えた。植食性，二足歩行性で，体長10mをこえる大型のものが多い。形態が多様化し繁栄した恐竜としても有名。とくに頭骨，顎骨，歯などに適応機構がみられる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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