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Montana State Fossil:
Duck-billed Dinosaur (Maiasaura peeblesorum)
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Montana designated the duck-billed dinosaur (Maiasaura peeblesorum) as the official state fossil in 1985. "Maiasaura" means "good mother lizard." Fossil skeletons of this dinosaur have been found with nests of eggshells and hatchlings, proving for the first time that some dinosaurs lived in herds and fed and raised their offspring. So far fossil remains of this Late Cretaceous dinosaur have been found only in Montana.

reconstruction of duck-billed dinosaur nest at the Natural History Museum in London - public domain image on wikipedia
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