The World Without Us

American Lion, or Panthera leo atrox, by Dantheman9758.

Giant Ground Sloth - Megatherium was one of the largest land mammals known, weighing up to 4 tonnes[8] and measuring up to 6 m (20 ft) in length from head to tail.[9][10] It is the largest known ground sloth, as big as modern elephants, and would have only been exceeded in its time by a few species of mammoth. The group is known primarily from its largest species, M. americanum. Megatherium species were members of the abundant Pleistocene megafauna, large mammals that lived during the...

Giant Ground Sloth Megatherium | Giant Ground Sloth | Extinct around 10,500 years Before Present (BP), though some dates suggest 8,000-7000 years BP.

Camelops is an extinct genus of camel that once roamed western North America, where it disappeared at the end of the Pleistocene about 10,000 years ago. It was very closely related to the Old World Dromedary and Bactrian Camel in anatomical form. Because soft tissues are generally not preserved in the fossil record, it is not certain if Camelops possessed a hump, like modern camels, or lacked one, like its modern llama relatives. Camelops hesternus was 7 ft (2.1 m) tall at the shoulder...

American lion skeleton from the La Brea Tar Pits, George C. Page Museum in Los Angeles. The American lion is an extinct lion of the family Felidae, endemic to North America during the Pleistocene epoch (340,000 to 11,000 years ago). It was part of the abundant Pleistocene megafauna, a wide variety of very large mammals that lived at the time. The most abundant remains have come from the La Brea Tar Pits. The American lion is one of the largest types of cat ever to have existed, slightly...

Short Faced Bear - The short-faced bear (Arctodus spp.) is an extinct bear that inhabited North America during the Pleistocene epoch from about 1.8 Mya until 11,000 years ago. It was the most common early North American bear and was most abundant in California. There are two recognized species: Arctodus pristinus and Arctodus simus, with the latter considered one of the largest known terrestrial mammalian carnivores.

American Mastodon by Charles Robert Knight, 1897.

Giant beaver, or castoroides, is an extinct genus of enormous beavers that lived in North America during the Pleistocene. C. leiseyorum and its northern sister species Castoroides ohioensis, were the largest beavers to ever exist. Giant beavers were much larger than modern beavers. Their average length was approximately 1.9 m (6.2 ft), and they could grow as large as 2.2 m (7.2 ft). The weight of the giant beaver could vary from 90 kg (198 lb) – 125 kg (276 lb). This makes it the largest...

A Storm Of Mammoths by Daniel Eskridge.

Short-faced Bear and Saber-toothed Cat by Daniel Eskridge.

Smilodon Fatalis by Daniel Eskridge

American mastodons, mother and child, recovered from the La Brea Tar Pits. These distant relatives of modern elephants lived in North America from 3.7 million years ago until just recently in 10,000 BC. George Page Museum, Los Angeles.