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燕尾鳳蝶幼蟲
The Giant Swallowtail Butterfly (Papilio cresphontes) is a swallowtail butterfly common in various parts of North America, particularly the south and east. With a wingspan of about 10-16 cm[1] , it is the largest butterfly in the United States.
P. cresphontes caterpillar shows defensive posture.
The mature caterpillar resembles bird droppings to deter predators.

(Photo Source : http://en.wikipedia.org )

圖片參考：http://upload.wikimedia.org/wikipedia/commons/2/2b/Papilio_cresphontes_larva_defensive.JPG