Tailed Jay / Graphium agamemnon
If I remember correctly, this was the only time I ever saw this species of butterfly in the ENMAX Conservatory at the Calgary Zoo. Taken on 23 August 2011. Isn't it a beautiful butterfly (even with one missing "tail")?
"The Tailed Jay (Graphium agamemnon) is a predominantly green and black tropical butterfly that belongs to the swallowtail family. The butterfly is also called Green-spotted Triangle, Tailed Green Jay, or the Green Triangle. It is a common, nonthreatened species native to India, Sri Lanka through Southeast Asia and Australia. Several geographic races are recognized." From Wikipedia.