Extinction: There are no living specimens of the animal available. Extinction may be total, or an animal may be 'extinct in the wild', meaning there are only zoo specimens available. Biological extinction is defined as animals continuing to exist, but with no viable production of young (Lonesome George: http://www.tortoisetrust.org/articles/george.html).
Extirpation: An animal no longer occurs in an area of its historic range.
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