
Giant Swallowtail Caterpillar
The Giant Swallowtail Caterpillar (Papilio cresphontes) resembles bird droppings to deter predators and if that doesn't work they use their red osmeterium. These are 'horns' which they can display & then retract. The colouration is dingy brown & or olive with white patches & small patches of purple. On Prickly Ash (Zanthoxylum americanum) Shirleys Bay, Ottawa, Ontario, Canada.

The giant swallowtail is the largest butterfly in North America. It is abundant through many parts of eastern North America; populations from western North America and down into Panama are now considered to belong to a different species, "Papilio rumiko".
comments (1)