The cougar (Puma concolor) is a large cat of the subfamily Felinae. Native to the Americas, its range spans from the Canadian Yukon to the southern Andes in South America and is the most widespread of any large wild terrestrial mammal in the Western Hemisphere. It is an adaptable, generalist species, occurring in most American habitat types. Due to its wide range, it has many names, including mountain lion, puma, catamount, panther and painter. The cougar is the second-largest cat in the New World after the jaguar (Panthera onca). Secretive and largely solitary by nature, the cougar is properly considered both nocturnal and crepuscular, although daytime sightings do occur. Despite its size, the cougar is more closely related to smaller felines, including the domestic cat (Felis catus) than to any species of the subfamily Pantherinae. The cougar is an ambush predator that pursues a wide variety of prey. Primary food sources are ungulates, particularly deer. It also hunts insects and rodents. It prefers habitats with dense underbrush and rocky areas for stalking, but also lives in open areas. The cougar is territorial and lives at low population densities. Individual home ranges depend on terrain, vegetation and abundance of prey. While large, it is not always the apex predator in its range, yielding prey it has killed to jaguars, American black bears, grizzly bears, packs of wolves or coyotes, and (in Florida) to American alligators. It is reclusive and mostly avoids people. Fatal attacks on humans are rare, but increased in North America, as more people entered cougar habitat and built farms. Intensive hunting following European colonization of the Americas and ongoing human development into cougar habitat has caused the cougar populations to drop in most parts of its historical range. In particular, the eastern cougar population is considered to have been mostly extirpated in eastern North America in the beginning of the 20th century, with the exception of the isolated Florida panther subpopulation.