The jaguar (Panthera onca, pronounce /ˡdʒægjuɚ/ in British English, or /ˡdʒægwɑr/ in American English) is a New World mammal of the Felidae family and one of four "big cats" in the Panthera genus, along with the tiger, lion, and leopard of the Old World. The jaguar is the third-largest feline after the tiger and the lion, and on average the largest and most powerful feline in the Western Hemisphere. The jaguar's present range extends from Mexico (with occasional sightings in the southwestern United States) across much of Central America and south to Paraguay and northern Argentina.