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Mesozoic mammals have been long thought of as generalized, nocturnal, terrestrial taxa that were constrained by selective and ecological pressures imposed by contemporary terrestrial vertebrates. However, this notion has been challenged by discoveries of the last two decades. A number of relatively complete Mesozoic mammal skeletons have distinctive morphologies that suggest their evolution of ecological diversity comparable to extant mammals. To test this hypothesis, I used qualitative and quantitative approaches to infer functional morphology, locomotor diversity, and ecological structure of Mesozoic mammals at the species, clade, and community scale, respectively. The first study uses functional morphology and comparative anatomy to infer locomotion and posture in a recently recovered Early Cretaceous eutriconodontan mammal, Yanoconodon allini. 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Investigating the functional morphology, locomotor diversification, and paleoecology of Mesozoic mammals. Text. 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