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Siproeta stelenes
This photo was taken at the Como Zoo.
"Often confused with Scarce Bamboo Page or Dido Longwing (Philaethria dido)" Wiki
The Dido Longwing is at http://en.wikipedia.org/wiki/Philaethria...
compare with Malachite at http://en.wikipedia.org/wiki/Siproeta_st...
Top forewing of Dido Longwing has a green drip away from the body.
It is named for the mineral malachite, which is similar in color to the bright green on the butterfly's wings....Adults feed on flower nectar, rotting fruit, dead animals, and bat dung. - Wikipedia