Dark And Cool
Although it is not likely that she left her cubs there on purpose, it is possible that she did so with good intentions. After all, sewer grates are cool and dark, just like how foxes want their dens to be.
Dark And Cool
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Mistake
If anything, the mother fox could have left the babies there while she looked for a better den. Although the sewer was cool and dark, that was where the similarities ended. It was not a good den, after all.
Mistake