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Kate Lyons, Assistant Professor of Biological Sciences, eyes the skeleton of an Allosaurus at the University of Nebraska State Museum. Research from Lyons and colleagues at the University of New Mexico suggests that the offspring of massive bipedal dinosaurs outcompeted medium-sized species for food, which would help explain the surprising lack of species diversity in an animal group that dominated the planet for roughly 140 million years. February 23, 2021. Photo by Craig Chandler / University Communication.