Ornithoptera aesacus
 
The specific epithet of Ornithoptera aesacus, is named after Æsacus, the eldest son of Priam. The Obi Island birdwing is endemic to the Island of Obira in Indonesia. It inhabits tropical rainforest. Due to extensive logging on the Island the conservation of the species is a concern, and has been classified as 'Vulnerable' by the IUCN Twenty years ago it was the rarest birdwing species in the world. It remains threatened, but is commercially bred.