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Message: <blockquote data-quote="Umbran" data-source="post: 6536570" data-attributes="member: 177">Interesting, but I have a *major* question about it.Note that the gestation period for mice is a whopping 20 days, on average.  By day 600, we are talking something on the order of 30 generations, starting from four breeding pairs. How much of the result was due to population pressure and filled social roles, and how much due to inbreeding?This does, however, illustrate where the "Secret of NIMH" came from. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" /></blockquote>