亞歷山大鳳蝶之雌蝶體形龐大，翅張可達28cm，黑褐色，前翅稍呈長三角形有淺土黃及近白色之斑紋，後翅除中室外，均有長形土黃斑紋。腹部為淺土黃色與雄蝶之黃色不同。產於新幾內亞的亞歷山大鳳蝶是世界最大的蝶，其雌蝶最大者翅張可達28cm，一般常為24cm左右。雄蝶通常為2Ocm左右。
Endangered and listed as appendix I in CITES, Alexandria'a birdwing is the largest butterfly known and is found in only a few localities in Papua New Guinea, flying in primary rain forest at canopy level. It is a lowland species and not found much above 700 meters elevation. Efforts may be underway to breed this magnificent insect, but its rarity and the need for gigantic flight cages makes this difficult. It has been suggested that bred specimens be sold by the Papuan government to finance conservation efforts, but this would require relisting it under appendix II and more research on its life history.
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