The biggest land animals are all on a plant-only diet. Why doesn’t eating meat make you big and strong?

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The maximum rate of mammal evolution
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“How fast can a mammal evolve from the size of a mouse to the size of an elephant? Achieving such a large transformation calls for major biological reorganization. Thus, the speed at which this occurs has important implications for extensive faunal changes, including adaptive radiations and recovery from mass extinctions. “

The Costs of Carnivory
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“Our model provides insights into dietary changes and the evolution of body size in mammalian carnivores. Using a simple energetic model, we predicted that hunting costs and resulting energy requirements would increase with an increase in prey size.”

On the Rareness of Big, Fierce Animals: Speculations About the Body Sizes, Population Densities, and Geographic Ranges of Predatory Mammals and Large Carnivorous Dinosaurs
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“Although some workers have suggested that tyrannosaurs and other large theropods were able to achieve huge size only by becoming sluggish carrion-eaters, an alternative explanation is presented here.”
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