how do endangered species deal with inbreeding?
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In addition to what others said, some species that live in environments that makes severe population reduction likely (eg, small islands) may have adaptions that makes inbreeding not cause much problems, such as the [Black Robin](https://en.wikipedia.org/wiki/Black_robin).
> All of the surviving black robins are descended from “Old Blue”, giving little genetic variation among the population and creating the most extreme population bottleneck possible. However, this does not seem to have caused inbreeding problems, leading to speculation that the species has passed through several such population reductions in its evolutionary past, and has lost any alleles that could cause deleterious inbreeding effects.
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