Christine holding male Cecropia Moth
This newly emerged Cercropia Moth, the largest species of Lepidoptera found in North America, was photographed at the home of my new friend Christine. She lives on the backshore of Gloucester and, with her friend Jane, who lives on the opposite side of Gloucester in the Lanesville area, are trying to repopulate Cape Ann with several species of the stunning and charismatic moths of the Saturn Family. These include the Cecropia Moth (commonly called Robin Moth), Luna Moth, and Polyphemus Moth.
Where formerly abundant, these most beautiful members of the native Giant Silkworm Moth group of Lepidoptera are at extreme risk of becoming extirpated (extinct from a region). Christine recalls a time when she could easily find the cocoons in her neighborhood. Now she finds none. The reasons for their decline are severalfold; loss of habitat, the poison in the pesticides sprayed on trees is highly toxic to all insects, and because they are suffering from a parasitism by a tachinid fly (Compsilura concinnata) that was introduced to control the Gypsy Moth. Each and every person on Cape Ann can help these moths make a comeback by making a commitment to not use pesticides and herbicides, for any reason, ever.
Cecropia Moth cocoon
Christine and Jane purchase the cocoons at Magic Wings in Deerfield, MA. They place the cocoons in the screened butterfly house where they have also placed branches of the caterpillar’s food plant (in this case, birch branches). Cecropia Moth caterpillar food plants include the foliage of maple, birch, ash, apple, cherry, and lilac.
If both male and female are present, they will mate almost immediately, within the first day or two, and the female will begin depositing eggs soon after. She releases the eggs on nearly every surface within the enclosure, dozens and dozens of eggs, up to 100!
Cecropia Moth eggs
If the eggs are viable, within several weeks, the caterpillars will chew their way out of the egg casing and begin to eat the caterpillar food plants provided.
Perhaps like Christine and Jane who, moth by moth, are trying to save our native Giant Silkworm Moths, you’ll be inspired to raise these North American beauties, too!
More photos to come if a batch of caterpillars emerges.
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Surrounding leaves, like a blanket, are arranged around the cocoon and also secured with silk threads. The house is quite large, about four inches long and an inch and a half in diameter. As you can see from the Instagram, she has room enough to easily move within the cocoon. When completed, she will pupate within the case. Come next spring, Mothra will emerge from her winter home ready to mate and deposit eggs of the next generation. The circle of life continues.
Mothra’s Dad
Beauty on the Wing 