Season can also have an effect and when the fox moults during the summer the longer guard hairs are lost, making the underside appear darker and the back lighter.
The backs of the ears are black or brownish-reddish, while the inner surface is whitish.
Kits require almost constant supervision; when still suckling, they require milk at four-hour intervals day and night.
In general, each fox claims its own territory and it pairs up only in winter.