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and fiercest, and strangest forms". In the 20th and 21st centuries, the term usually refers to large animals. There are variations in thresholds used to define megafauna as a whole or certain groups of megafauna. Many scientific literature adopt Paul S. Martin's proposed threshold of to classify animals as megafauna. However, for freshwater species, is the preferred threshold. Some scientists define herbivorous terrestrial megafauna as having a weight exceeding , and terrestrial carnivorous megafauna

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