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Pig - Wikipedia
Pig | Description, Breeds, & Facts | Britannica
Pig - National Geographic Kids
Pigs, Hogs & Boars: Facts About Swine | Live Science
Pigs - Facts, Information & Farm Pictures - Animal Corner
Pig Animal Facts | Sus scrofa scrofa - A-Z Animals
Pigs | The Humane Society of the United States
Pig - Description, Habitat, Image, Diet, and Interesting Facts
Suidae - Wikipedia
Sus (genus) - Wikipedia