Common Birdwing

Troides helena, the Common Birdwing, is a butterfly belonging to the family Papilionidae. It is often found in the wildlife trade due to its popularity with butterfly collectors. The butterfly has seventeen subspecies. T. helena is widely distributed and locally common in forest areas. Globally it is found in Nepal, India, Bangladesh, Myanmar, peninsular and eastern Malaysia, Singapore, Indonesia, Laos, Kampuchea, Thailand, Vietnam, southern China including Hainan, and Hong Kong. Source: Wikipedia

See Suan Rot Fai for further details of this good birding and general wildlife location. It is a hidden gem close to the chaos and confusion of Chatuchak Market.