The Attacus genus occurs from southeast Asia to Australia.  It has some of the largest moths on the planet as members. The well known Attacus atlas, lorquinii and ceasar are easy to obtain, however not always that easy to rear despite what some might say. If they do not like your rearing conditions, they will be next to impossible to keep alive. However, when they do like your home, they can be as easy as a Samia.