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'''Interbreeding ''' occurs when two nonhuman animals, or plants of two different species produce offspring.<ref>The American Heritage® Dictionary of the English Language, Fourth Edition: [http://dictionary.reference.com/browse/interbreeding"Interbreeding"]</ref> Examples of these offspring include common animals such as the [[mule]] and more obscure animals like the [[wholphin]]. Interbreeding is not possible in other kingdoms of life.{{fact}}