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The cecropia moth (Hyalophora cecropia) is commonly described as North America’s largest native moth by wingspan. Published measurements vary, so the figures are best read with their sources rather than as one exact maximum: Butterflies and Moths of North America reports 11–15 cm, while University of Maine Cooperative Extension notes documented spans over 6.2 inches.
This giant silk moth is a member of Saturniidae. Its large size, brown or reddish-brown wings, pale bands, and conspicuous pale crescent-shaped marks are useful identification clues. Its caterpillar feeds on many kinds of woody plants, and the adult moth does not feed.
At a glance
| Feature | Details |
|---|---|
| Scientific name | Hyalophora cecropia |
| Family | Saturniidae, the giant silk moth family |
| Wingspan | Butterflies and Moths of North America reports 11–15 cm; University of Maine Cooperative Extension notes documented spans over 6.2 inches |
| Range | Eastern and central North America, from eastern Canada southward and west toward the Rocky Mountains |
| Caterpillar food | A variety of woody plants, including maple, cherry, birch, apple, and willow |
| Adult feeding | Adults do not feed; they rely on reserves accumulated during the caterpillar stage |
How big is a cecropia moth?
The cecropia is widely described as North America’s largest native moth by wingspan, but published measurements are not identical. Butterflies and Moths of North America gives a wingspan range of 11–15 cm. University of Maine Cooperative Extension notes that documented wingspans over 6.2 inches exist. The figures should not be collapsed into a single universal range: one is a reported species range, while the other describes documented larger specimens.
| Source | Reported measurement | How to interpret it |
|---|---|---|
| Butterflies and Moths of North America | 11–15 cm | Reported wingspan range |
| University of Maine Cooperative Extension | Over 6.2 inches | Documented spans above this size |
These figures support the familiar superlative, but they do not mean every cecropia reaches the largest reported size. The title’s claim is specifically about native North American moths and wingspan.
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How to identify a cecropia moth
Cecropias are large moths with reddish-brown to dark brown wings, pale bands, and prominent pale crescent-shaped markings. Color and pattern can vary, so identify the moth using a cluster of features rather than one color cue alone. Its family, Saturniidae, includes other large moths, so size by itself is not enough for a confident identification.
Where cecropia moths live
The species occurs broadly across eastern and central North America, from eastern Canada southward and west toward the Rocky Mountains. The University of Florida IFAS account describes its range from Nova Scotia and Maine south to Florida and west to the Canadian and U.S. Rocky Mountains.
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Adult timing depends on location. Butterflies and Moths of North America describes flight from March through July across much of the range and notes a second flight in parts of the Midwest. A Minnesota account reports May through July. These are regional observations, not a single fixed flight season for every part of the range.
What do cecropia caterpillars eat?
Cecropia caterpillars feed on a wide variety of woody plants; no single tree is their exclusive host. Reported examples include maple, cherry and plum, apple, birch, dogwood, and willow. Butterflies and Moths of North America reports that young caterpillars initially feed in groups and later become solitary.
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Females lay eggs on host plants. Caterpillars feed and grow through several instars before spinning a cocoon attached to vegetation. The pupa overwinters inside the cocoon, and adults emerge in the following season. Timing varies with region and conditions, so exact durations for each life stage should not be treated as universal.
Why adult cecropia moths do not eat
Adult cecropia moths do not feed because they lack mouthparts. University of Maine Cooperative Extension explains that adults survive on body fat stored during the caterpillar stage. Their short adult phase is therefore supported by energy accumulated earlier in life, rather than by nectar or other food taken as adults.
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Frequently Asked Questions
Is the cecropia moth North America’s largest native moth?
It is commonly described as North America’s largest native moth by wingspan. Reported measurements vary by source, so the claim should be understood as a wingspan comparison, not a claim about every measure of size.
How large can a cecropia moth’s wingspan be?
Butterflies and Moths of North America reports 11–15 cm. University of Maine Cooperative Extension notes documented spans over 6.2 inches. These figures have different source framing and should not be treated as one exact universal range.
What do cecropia caterpillars eat?
They feed on a broad variety of woody plants, including maples, cherries and plums, apples, birches, dogwoods, and willows. The host plants used can vary by location.
Do adult cecropia moths eat?
No. They lack mouthparts and rely on energy reserves accumulated during the caterpillar stage, according to University of Maine Cooperative Extension.
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