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In page Inbreeding:

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Although there are several examples of inbred populations of wild animals, the negative consequences of this inbreeding are poorly documented.[citation needed] In the South American sea lion, there was concern that recent population crashes would reduce genetic diversity. Historical analysis indicated that a population expansion from just two matrilineal lines was responsible for most of the individuals within the population. Even so, the diversity within the lines allowed great variation in the gene pool that may help to protect the South American sea lion from extinction.[1]