However, in many ways it can be assumed that over time some Arctocyonidaes increasingly began to include in their diet vegetarian food, in parallel increasing in sizes. The second half of Paleocene Arctocyonidaes, for example, have already reached the size of wolves or even small bears.

Hyaenodons - creodontas genus of the gienodontal family (Hyaenodontidae) from the middle Eocene - early Miocene of Europe, Asia and North America.
Members of the genus differ considerably in size and occupied various niches of terrestrial predators. The earliest known Hyaenodons found in Asia and the date middle-eocene age. During the second half of the Eocene epoch Hyaenodons settled across the northern hemisphere, often occupying released endangered oxyenides (Oxyaenidae) ecological niche. They have become quite commonplace in much of Asia, North America and Europe, but Africa somehow passed.
It may seem that outwardly resembled Hyaenodons several modern members of the canine family, in fact, they were far from their peers. This race is much more united in a variety of animals, who have held a variety of niches predators of the land.
The largest of the genus, for example, Hyaenodon gigas, didn’t yield in their sizes the largest tiger's: the head, according to the size of their teeth and jaw fragments, reached 50 cm or more. Support a heavy head is rather short and very strong neck. Powerful neck was also need to keep their teeth and caught escaping prey. Judging by the structure of the cervical spine, Hyaenodons have been set high head, so their neck is positioned almost vertically. They grabbing their prey, like the modern dogs, a toothy mouth (not like a cat - with claws and teeth).
The larger members of the genus are relatively long and slender limbs, based on several parties divorced in the fingers, and apparently adapted to the active movement on hard ground. With moving the hind limbs Hyaenodons could make sharp throws for prey, and the front may have been needed to cope with food until it got to fall. It is very likely that these predators were digging with its front paws the ground, looking for small animals, that live in burrows, or holes arranged themselves.
With a rather massive addition, gienodons, probably, wouldn’t have been able to a long running.They were likely ambush predators, briefly, but actively pursuing prey - approximately the same goes most of today's large and small cats. There is no doubt that Hyaenodon was able to catch, throw and to cut a relatively large animal.

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Pyrotherium - extinct South American mammals of the superorder hoofed animals that lived in the Eocene and Oligocene. Pyrotherium have convergent similarity with the primitive Proboscidea, which was caused by the similarity of their ecological niches occupied.
Pyrotherium differed massive physique, columnar legs with short and wide toes, as well as a large head with a small trunk. The four upper and two lower incisor teeth, resembling tusks, were issued in advance. These animals reach 3 m in length and 1.5 m tall at the shoulders.
The name, which in Greek means «the fiery beast», was given because of the fact that the first fossils of Pyrotherium were found in sedimentary rocks of volcanic ash.
In comparison with other orders of the South American ungulates, Pyrotheriums were relatively not varied order. Period of their existence is also not particularly long. Pyrotherium kinship with other South American ungulates (Meridiungulata) is currently not clear. The structure of the tarsus does not indicate any obvious relationship with them. Most Pyrotherium’s tarsus is similar to Arsinoitherium’s tarsus, but it is unclear about evidence of relationship of these animals (who are representatives of different orders), or this similarity is dictated by a similar method of movement (it means - convergence).

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Macrauchenia patagonica – representatives of the order litopterna, which belonged to a very specific South American ungulates. Most of the representatives litoptern extinct at the end of the Pliocene, after an overland to North America, the emergence of new predators and competition from new prey. Macrauchenias were quite attuned to adapt to survive until the end of the Pleistocene. Macrauchenia patachonica died, apparently, only 10 thousand years ago.
This ungulate reached 1,8 m height at the shoulders, which corresponds to the modern camel, and weighed a ton. Long and very strong legs ended with three fingers. The neck was very long, and the front segment is probably end with proboscis, adapted for plucking leaves, although the structure of teeth more like a grass eaters. The remains of Macrauchenias were found, first of all, in the southeastern Pampas, but the findings are also known in Venezuela. The original image size (300 dpi:)  A-4+ (A-3) - 300$    A-5 - 150$    A-6 -  100$

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