Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. High Quality Content by WIKIPEDIA articles! The American lion (Panthera leo atrox) also known as the North American lion or American cave lion, is an extinct feline of the family Felidae, endemic to North America during the Pleistocene epoch (1.8 mya to 11,000 years ago), existing for approximately 1.79 million years. The American lion was one of the largest subspecies of cat ever to have existed, and the largest lion in history, slightly larger than the Early Middle Pleistocene primitive cave lion, Panthera leo fossilis, and about twenty-five percent larger than the modern African lion. Some estimates of the mass of this animal are as high as 500 kg (1,100 lb).

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