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Papilio aegeus
Caterpillars feed on citrus. Young caterpillars are brown & white & resemble bird droppings. Older ones are comouflage green. When disturbed , the caterpillars extrude reddish tentacles from their heads & emit a strong smell.
Found all over a lemonade tree (citrus).
Caterpillars are variable in color, usually brown . . .
http://www.flickr.com/photos/qrius22/557...
. . . but sometimes green:
http://liljana.deviantart.com/art/This-l...
I do think so. They seemed to start off green & then slowly go browner & then turn into a chrysalis. Though I'm not 100% sure