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[Fuscus]

It is illeagal to breed them, I don't know about keeping them. But if you tried to import a cross and declared it as such, you would almost certainly be knocked back. If you brought it in as a jungle or a diamond and if it was detected you could be guilty of any number of offenses.
And to complicate matters they may or may not reconize the animals as seperate sub-species, I would play it safe and stear clear of the animals.