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Danaus plexippus
On a milkweed plant... Is this a monarch?
Would make a great addition to the Monarch Migration mission! You can join here: http://www.projectnoah.org/missions/8100....
Yes this is a monarch caterpillar. It has two paris of black filaments. this is how you tell the Monarch caterpillar from a Queen caterpillar that also feeds on milkweed. The Queen caterpillar has 3 pairs, the extra one is in the middle of the caterpillar.