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Photo#334955
Western Tiger Swallowtail Caterpillar, brown form - Papilio rutulus

Western Tiger Swallowtail Caterpillar, brown form - Papilio rutulus
Puyallup, Pierce County, Washington, USA
September 19, 2009
I guess they turn brown just before pupating.

yep
and they do it real fast. i was amazed, i saw it green and eating and 40 minutes later it was brown and off the food.

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