structural:reformatting, stylistic:tone
Wildlife

Human activity has caused major changes to the wildlife of the Pampas. Most big or medium-sized species such as puma, rhea, Capybara, plains viscacha, maned wolf, marsh deer and Pampas deer have lost their habitats especially due to the spread of agriculture and ranching, and are only present in very few relicts of the pampas. Other species, such as the Jaguar and the Guanaco have been extirpated completely from this habitat.

Mammals that are still fairly present include Brazilian guinea pig, southern mountain cavy, coypu, Pampas fox, Geoffroy's cat, lesser grison, white-eared opossum, Molina's hog-nosed skunk, big lutrine opossum, big hairy armadillo and southern long-nosed armadillo. Bird species of the pampas are ruddy-headed goose, pampas meadowlark, hudsonian godwit, maguari stork, white-faced ibis, white-winged coot, southern screamer, dot-winged crake, curve-billed reedhaunter, burrowing owl and the rhea. Invasive species include the European hare, wild boar and house sparrow.

Most of the large mammals native to the Pampas became extinct as part of the end-Pleistocene extinction event of most large mammals across the Americas around 12,000 years ago. Notable former inhabitants of the Pampas include the giant elephant-sized ground sloth Megatherium americanum, along side the smaller (though still large) ground sloths Mylodon, Glossotherium Lestodon and Catonyx, the rhinoceros like ungulate Toxodon, the camel-like Macrauchenia, the gomphothere (elephant-relative) Notiomastodon, the equines Equus neogeus and Hippidion, and the glyptodonts (car-sized relatives of armadillos) Glyptodon and Doedicurus, the bear Arctotherium and the sabertooth cat Smilodon populator.