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Golden Birdwing (Troides aeacus) is a large butterfly belonging to the Swallowtail (Papilionidae family). Troides aeacus has a wingspan reaching about 15–16 centimetres (5.9–6.3 in). In the males the fore wings are black, with veins bordered by whitish colour, while the hind wings are bright yellow. The underside of the wings is quite similar to the upside. The females are larger than the males and have dark-brown or black wings.
Seen in a butterfly garden 30 kms from Siem Reap, Cambodia.