The best known member of the Bombyx genus is of course Bombyx mori, the domesticated silkworm. But did you know that there are eight other species occurring in the wild? All in Asia.
Too bad you can't get them in Europe. The moths are too small and dull for the taste of most. Occasionally there are some offers for Bombyx mandarina, but that's it. That's a shame, because they probably are not more difficult to rear then Bombyx mori.