Dark And Cool
It does not sound probable that the mother left the babies in the sewer grate on purpose. However, there might be a reason if she did. Fox dens are cool and dark places, so the sewer grate is fitting.
Dark And Cool
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Mistake
Perhaps the mother fox made a mistake by leaving them behind as she found a better den. The sewer might have been cool and dark, but it did not make for a great place to raise the cubs in.
Mistake
