The 24 Samia species are all East Asian. One species, Samia cynthia, has managed to establish viable populations in southern Europe and the USA after escaping from silk farms. The moths are not very large, but at least two of them (ricini and cynthia) are among the most popular species reared in captivity. For good reasons. They are nearly indestructible and without any doubt the best species for newcomers. That is, if you can obtain fresh and healthy stock. Their popularity often results in inbred.