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kat.herbalmedicine Eastern Black Swallowtail caterpillar
Eastern Black Swallowtail caterpillar commented on by kat.herbalmedicine Niagara Falls, Canada11 years ago

When the osmeterium sticks out you can smell the plant that they have been eating. They feed on fennel ( smell like licorice), wild carrot ( carrots of course) and dill ( these smell like pickles). It may be part of a defense mechanism.

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