Don't quote me on this, but I think a large part of why females should outnumber males has to do with the stress it puts on them. In this case, all of the dudes will be wanting to get with her, and as the only female, she'd get exhausted pretty quick, especially with how fast they reproduce. Mind you, I'm trying to recall this from back in the day when I used to have pet mice, so it might not be entirely accurate..
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