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Monarch Butterflies (Danaus plexippus) and Butterfly Weed (Asclepias tuberosa) Monarch Butterflies and Butterfly Weed, a type of milkweed, have coevolved as plant and pollinator. This means that they both rely on one another to survive. Milkweed is the primary sou ....

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.... a chrysalis by forming a cocoon it uses the plant again. The caterpillar forms its cocoon on the Butterfly Weed. By the time the caterpillar is ready to become a chrysalis it has grown to be about 45 millimeters in length. The chrysalis is pale green and spotted with gold. It becomes more transparent as the butterfly gets ready to break free. The adult Monarch has a wingspan of about 4 inches. The male and female can be told apart by a gland on the wings. It is apparent as a black circle on the male, which is not present in the female. The Monarch is native to North and Central America. The plant and its pollinator have grown to depend on each other. ....