led him to the conclusion that these duckbilled dinosaurs were gregarious and traveled in herds.

Deinonychus

Ostrom worked in the Cloverly Formation Site in Montana and Wyoming from 1962 to 1966. Late in 1964, he detected unfamiliar fossils in the Bridger Fossil Area, near the town of Bridger, Montana. In subsequent seasons, his team unearthed four specimens of a small bipedal carnivorous theropod, and parts of a larger plant-eating dinosaur. The discovery of the Deinonychus

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