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Cecropia Moth Cocoon

Cecropia Moths Mating

Cecropia moths (Hyalophora cecropia) are the largest native North American moths. They are members of a group of moths known as giant silk moths (family Saturniidae), renowned for their large size and showy appearance.

Having overwintered as pupae inside silk cocoons they spun (as larvae) in the fall, the adults emerge at this time of year often during the first spell of hot, humid weather by dissolving one end of their cocoon with their saliva.  The female Cecropia emits pheromones at night that are so strong that males can detect them with their feathery antennae from as far as a mile away.  Once paired, Cecropia moths proceed to mate for a full day before parting company. 

Shortly thereafter the female moth lays up to 100 eggs, often on both sides of a leaf. Due to a lack of functional mouth parts and no digestive system, the adults seldom live more than two weeks after mating. (Photo: female Cecropia moth on left (larger abdomen filled with eggs; narrow antennae); male on right (smaller abdomen; broader, more feathery antennae). Many thanks to Lorraine Vorse for photo opportunity!

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Note that mating took place very near the (female’s) cocoon (lower right).