A newly identified tiny dinosaur, Foskeia pelendonum, is shaking up long-held ideas about how plant-eating dinosaurs evolved. Though fully grown adults were remarkably small and lightweight, their anatomy was anything but simple—featuring a bizarre, highly specialized skull and unexpected evolutionary traits. Detailed bone studies show these dinosaurs matured quickly with bird- or mammal-like metabolism, while their teeth and posture hint at fast, agile lives in dense forests.
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