ナショナルジオグラフィックのインスタグラム(natgeo) - 4月5日 00時13分

Photo @Cory Richards Dromaeosaur tooth (likely a new species) from the late Cretaceous found in Escalante Grand Staircase National Monument . Shot #on assignment for @ナショナルジオグラフィック Dromaeosaurs are family of bird-like theropod dinosaurs, which included the famous Velociraptor. They were small- to medium-sized feathered carnivores which flourished in the Cretaceous period.

They are often called raptors, a term popularized by the movie Jurassic Park. They were fast-running predators.

Dromaeosaurs had a world-wide distribution. They first appeared in the Middle Jurassic, 167 million years ago (mya). The larger types are not found before about 124 mya in the Lower Cretaceous, and are only found in the northern hemisphere. They survived until the end of the Cretaceous, 65.5 mya at the K/T extinction @thephotosociety @natgeocreative

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