As the saying goes, opposites attract
There is no reason to think this would happen between cats and hedgehogs. Musya had raised a family of eight hedgehogs. Although other animals avoided them because of their stings, she was unafraid of theirs. Alice was nonetheless anxious about the kittens’ safety, despite the scenery’s beauty.
As a result, she attempted to bottle-feed the hedgehogs and remove them from the cats’ reach, but they refused to eat. The only option she had was to let Musya handle the mothering. There have been past instances when a species has taken in a non-dominant member of its own species.