The domestic pig (also swine, in some areas hog) is a domesticated animal that traces its ancestry to the wild boar, and is considered a subspecies of the wild boar or a distinct species in its own right. It is likely the wild boar was domesticated as early as 13,000 BC in the Tigris River basin. Pigs are farmed for the consumption of their flesh, but some cultures have religious dietary laws that forbid the consumption of pig meat. The animal's bones, hide, and bristles have been fashioned into items such as brushes. Pigs, notably the pot bellied pig, are also kept as pets. Miss Piggy, Babe, and Porky the Pig represent the domestic pig in entertainment and "The Three Little Pigs", Charlotte's Web, and The Sheep-Pig are prominent examples of the domestic pig in literature.
Omnivores (from Latin: omni, meaning "all, everything"; vorare, "to devour") are species that eat both plants and animal material as their primary food source. They often are opportunistic, general feeders not specifically adapted to eating and digesting either meat or plant material primarily. Many depend on a suitable mix of animal and plant food for long-term good health and reproduction.
Although the term omnivore literally means "eater of everything," omnivores really cannot eat everything that other animals eat; they can eat only things that are moderately easy to acquire while being moderately nutritious. For example, most omnivores cannot live by grazing (not nutritious enough), nor are they able to eat some hard-shelled animals or successfully hunt large or fast prey (difficult to acquire).
Although there are cases of carnivores eating plant matter, as well as examples of herbivores eating meat, the classification "omnivore" refers to the adaptations and main food source of the species in general, so these exceptions do not make either individual animals nor the species as a whole omnivorous.
Pigs are a well-known example of omnivores. The crow is another example of an omnivore.
Humans are different from other omnivorous species, and it is disputed whether humans are actually herbivores. While they share virtually none of the characteristics of most other omnivores or carnivores, such as claws, fangs, or short digestive tracts, the majority of humans eat as omnivores, consuming on a daily basis both plants and animals. Humans have rounded molars, long intestines, and blunt canine teeth, but they also have a reduced cecum and engage in cooperative group-hunting.