On Location: The Miniature Pig
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http://www.philadelphiazoo.org/ A miniature pig is one of the breeds developed and used for medical research or developed for use as a pet. These smaller pigs were first used for medical research in Europe before being introduced to the United States as pets in the 1980s. Since then, the animals have been used in studies by scientists around the world, including for study as a source of organs for organ transplantation.