The Great Eggfly Butterfly (Hypolimnas bolina) is a member of the nymphalidae family and found in South and SE Asia, Australia, Japan, New Zealand, and islands in the South Pacific.
I found this one in the butterfly garden of The Pullman Resort on China Beach (now called Danang or My Khe Beach) in Danang.
Thanks to my friend, entomologist, Lien Vu, for ID help. I hope to see him soon in Vietnam.....and get some more great butterfly photos. Check out his photos here Lien Vu on P Base And thanks to the beautiful Pullman Resort for their lovely butterfly garden.