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The maned wolf is omnivorous. It specialises in preying on small and medium-sized animals, including small mammals (typically rodents and rabbits), birds, and even fish, but a large portion of its diet (more than 50%, according to some studies) is vegetable matter, including sugarcane, tubers, and fruit. Up to 301 food items have been recorded in the maned wolf’s diet, including 116 plants and 178 animal species.

The maned wolf hunts by chasing its prey, digging holes, and jumping to catch birds in flight. About 21% of hunts are successful. Some authors have recorded active pursuits of the Pampas deer. They were also observed feeding on carcasses of run down animals. Fecal analysis has shown consumption of the giant anteater, bush dog, and collared peccary, but it is not known whether these animals are actively hunted or scavenged. Armadillos are also commonly consumed. Animals are more often consumed in the dry season.

The wolf apple (Solanum lycocarpum), a tomato-like fruit, is the maned wolf’s most common food item. With some exceptions, these fruits make up between 40 and 90% of the maned wolf’s diet. The wolf apple is actively sought by the maned wolf, and is consumed throughout the year, unlike other fruits that can only be eaten in abundance during the rainy season. It can consume several fruits at a time and disperse intact seeds by defecating, making it an excellent disperser of the wolf apple plant.

Despite their preferred habitat, maned wolves are ecologically flexible and can survive in disturbed habitats, from burned areas to places with high human influences. Burned areas have some small mammals, such as hairy-tailed bolo mouse (Necromys lasiurus) and vesper mouse (Calomys spp.) that they can hunt and survive on.
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Evolution of the wolf
The fossil record for ancient vertebrates is composed of rarely occurring fragments from which it is often impossible to obtain genetic material. Researchers are limited to morphologic analysis but it is difficult to estimate the intra-species and inter-species variations and relationships that existed between specimens across time and place. Some observations are debated by researchers who do not always agree, and hypotheses that are supported by some authors are challenged by others.

There is general agreement on the most ancient record, which shows that feliforms and caniforms emerged within the super-family Carnivoramorpha 43 million years before present (YBP). The caniforms included the fox-like genus Leptocyon whose various species existed from 34 million YBP before branching 11.9 million YBP into Vulpes (foxes) and Canini (canines). The jackal-sized Eucyon existed in North America from 10 million YBP and by the Early Pliocene about 6–5 million YBP the coyote-like Eucyon davisi invaded Eurasia. In North America it gave rise to early Canis which first appeared in the Miocene (6 million YBP) in south-western US and Mexico. By 5 million YBP the larger Canis lepophagus appeared in the same region.:p58

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