American Mammoth (Mammuthus columbi)

[The Perilous Dreamer]

First I will post the reference materials:

North American megafauna

American Mammoth (Mammuthus columbi)

The Columbian mammoth (Mammuthus columbi) is an extinct species of mammoth that inhabited North America as far north as the Northern United States and as far south as Costa Rica during the Pleistocene epoch. It was one of the last in a line of mammoth species, beginning with Mammuthus subplanifrons in the early Pliocene. DNA studies show that the Columbian mammoth was a hybrid species between woolly mammoths and another lineage descended from steppe mammoths; the hybridization happened more than 420,000 years ago. The pygmy mammoths of the Channel Islands of California evolved from Columbian mammoths. The closest extant relative of the Columbian and other mammoths is the Asian elephant.

[The Perilous Dreamer]

Reaching 13 ft at the shoulders and 22,000 lb in weight, the Columbian mammoth was one of the largest species of mammoth. It had long, curved tusks and four molars, which were replaced six times during the lifetime of an individual. It most likely used its tusks and trunk like modern elephants—for manipulating objects, fighting, and foraging. Bones, hair, dung, and stomach contents have been discovered, but no preserved carcasses are known. The Columbian mammoth preferred open areas, such as parkland landscapes, and fed on sedges, grasses, and other plants. It did not live in the Arctic regions of Canada, which were instead inhabited by woolly mammoths. The ranges of the two species may have overlapped, and genetic evidence suggests that they interbred. Several sites contain the skeletons of multiple Columbian mammoths, either because they died in incidents such as a drought, or because these locations were natural traps in which individuals accumulated over time.

[The Perilous Dreamer]

For a few thousand years prior to their extinction, Columbian mammoths coexisted in North America with Paleoamericans – the first humans to inhabit the Americas – who hunted them for food, used their bones for making tools, and depicted them in ancient art. Columbian mammoth remains have been found in association with Clovis culture artifacts; these remains may have stemmed either from hunting or scavenging. The Columbian mammoth disappeared at the end of the Pleistocene around 11,500 years ago, most likely as a result of habitat loss caused by climate change, hunting by humans, or a combination of both.

[The Perilous Dreamer]

The earliest known members of Proboscidea, the clade that contains the elephants, existed about 55 million years ago around the Tethys Sea area. The closest living relatives of the Proboscidea are the sirenians (dugongs and manatees) and the hyraxes (an order of small, herbivorous mammals). The family Elephantidae existed six million years ago in Africa, and includes the living elephants and the mammoths. Among many now extinct clades, the mastodon (Mammut) is only a distant relative, and part of the distinct family Mammutidae, which diverged 25 million years before the mammoths evolved. The Asian elephant (Elephas maximus) is the closest extant relative of the mammoths.

[The Perilous Dreamer]

Columbian mammoths had very long tusks (modified incisor teeth), which were more curved than those of modern elephants. The largest known mammoth tusk, 16 ft long, belonged to a Columbian mammoth, and others range from 11.5 to 13.5 ft long. Columbian mammoth tusks were usually not much larger than those of woolly mammoths, which reached 14 ft. The tusks of females were much smaller and thinner. About a quarter of the tusks' length was inside the sockets; they grew spirally in opposite directions from the base, curving until the tips pointed towards each other, and sometimes crossed. Most of their weight would have been close to the skull, with less torque than straight tusks would have generated. The tusks were usually asymmetrical, with considerable variation; some tusks curved down, instead of outwards, or were shorter due to breakage. Columbian mammoth tusks were generally less twisted than those of woolly mammoths.