There is absolutely no doubt that most mothers have an instinct to protect their own, but that also applies to other babies as well. Mothers just have an instinct to care for, and protect, children. This applies not only to human beings, but mothers of all kinds. When it comes to wild animals, however, that instinct is generally kept to their species. Recently, though, one lioness defied what we assume to be common knowledge and did the complete opposite.
Baby fox is ... Friend?