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Fossils reveal mammals mingled in age of dinosaurs – EurekAlert

A cluster of ancient mammal fossils discovered in western Montana reveal that mammals were social earlier than previously believed, a new study finds.

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The fossil remains of several small mammals discovered in tightly packed clusters in western Montana provide the earliest evidence of social behavior in mammals, according to a new study co-authored by a Yale scientist.
The fossils, which are about 75.5 million years old but exquisitely preserved, offer a rare glimpse into mammalian behavior during the Late Cretaceous Period when dinosaurs dominated, and indicate that mammals developed sociality much earlier than previously thought, said Eric Sargis,…

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