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Ornithoptera euphorion
Large green butterfly with brightly colored underside, is the largest of australia's butterflies. The female is larger than the male and less brightly colored. See third frame underside
This is the Cairns Birdwing butterfly. Ornithoptera euphorion. I presume these were in fact taken at the Melbourne Zoo which breeds these, and has just bred its 50,000th specimen. If not must be an escapee!!!