It is a common trope in the hobby to see people claim that snakes are sedentary in the wild and, thus, inbreeding is not an issue. This is more a justification for inbreeding that it is based on fact. The huge range distributions of the species we are dealing with proves that they are actually pretty good at traveling around. When you further account for spacial, temporal and sexual distancing and how they relate to population dynamics then you come to recognize that inbreeding is not that common in nature.
There are exceptions - insular species/populations and the like - but they are exactly that, exceptions and not the rule
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Lab mice/rats are the result if highly intentional artificial selection. They also tend to have shorter lifespans, reduced long-term fecundity, and develop cancers at an ungodly high rate because of a lack of heterogeneity brought about by systemic inbreeding. None of which tend to be observed by feeder breeders because of the turnover rate of the colonies.