Rare animal breeding

I often read about rare breeds that have managed to breed successful. In order for the species to repopulate there presumably needs to be a mixture of male and female offspring. Also those offspring siblings need to breed with each other. Is that a natural thing that happens in the wild.? Does interbreeding cause complications in other species as it does in humans?

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dirge

yes and yes. populations can become small enough to effectively doom themselves.
the problems introduced with inbreeding tend to be overstated, but they do exist.