Macrauchenia

Macrauchenia ("long llama", based on the now superseded Latin term for llamas, Auchenia, from Greek "big neck") was a large, long-necked and long-limbed, three-toed native South American cenozoic mammal in the order Litopterna.[1] The genus gives its name to its family, the Macraucheniidae or "robust litopterns." Like other litopterns, it is not closely related to any living mammal. The oldest fossils in the genus date to the late Miocene, around seven million years ago, and M. patachonica disappears from the fossil record during the late Pleistocene, around 20,000-10,000 years ago. M. patachonica is the last and best known member of the family and is known primarily from the Luján Formation in Argentina. The type specimen was discovered by Charles Darwin during the voyage of the Beagle. In life, Macrauchenia may have resembled a hump-less camel, though the two taxa are not closely related.[2] It fed on plants in a variety of environments across what is now South America. Among the species described, M. patachonica and M. ullomensis are considered valid; M. boliviensis is considered a nomen dubium; and M. antiqua (or M. antiquus) has been moved to the genus Promacrauchenia.

Macrauchenia had a somewhat camel-like body, with sturdy legs, a long neck and a relatively small head. Its feet, however, more closely resembled those of a modern rhinoceros, with one central toe and two side toes on each foot. It was a large animal, with a body length of around 3 metres (9.8 ft) and a weight up to 1,042.8 kg (2,299 lb), about the size of a black rhinoceros.[14][15]

One striking characteristic of Macrauchenia is the openings for the nostrils on top of the head, above and between the eyes. Increasingly retracted nostrils are an evolutionary trend in later litopterns. Because mammals with trunks show the nostrils in a similar position, a popular hypothesis is that Macrauchenia had a trunk similar to a tapir or an inflated snout like that of the Saiga antelope, perhaps to keep dust out of the nostrils.[14] Classic images and toys familiar to many people show the animal with a short trunk. However, a recent study comparing the skulls of tapirs and various other herbivorous extant and extinct mammal species instead saw similarities with the skulls of moose, suggesting that Macrauchenia and other macraucheniids such as Huayqueriana did not possess trunks.[16] The snout of Macrauchenia is completely enclosed by bone, and the animal has an elongated neck that allowed it to reach upward; no living mammal with a proboscis has these features. An alternative hypothesis is that these litopterns were high browsers on tough and thorny vegetation, and retracted nostrils allowed them to reach leaves without being impaled in the nose. Sauropod dinosaurs (reconstructed as high browsers on conifer needles and cycads) have similar snouts, and living giraffes and gerenuks, high browsers on thorny vegetation, have more retracted nostrils than related taxa with other feeding habits.[7]

Restoration of M. patachonica with a trunk
One insight into Macrauchenia's habits is that its ankle joints and shin bones may indicate that it was adapted to have unusually good mobility, being able to rapidly change direction when it ran at high speed.[2]

Macrauchenia is known, like its relative Theosodon, to have had a full set of 44 teeth

   their are a few species of macrauchenia in equestria, one of them is yellow with a brown back with a chubby build and more elephant or rhino like hooves

The other species is more brown with a black trunk and a build that lives up to its fossilized counterpart