Imperial Moth

Eacles imperialis

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The Imperial Moth is a strikingly large and colorful moth belonging to the Saturniidae family, known for its regal appearance and impressive size. Like other members of this family, its adult stage is short-lived and entirely devoted to reproduction.

Imperial Moth

Common Name
Imperial Moth

Latin Name

Eacles imperialis


Found in the eastern part of North America, from southern Canada down through the eastern United States to Mexico.


Caterpillar: The caterpillar goes through several color phases, but mature larvae are typically a greenish-yellow with blue tubercles and pinkish/red setae (hairs). Moth (not butterfly): The adult Imperial Moth is characterized by its bright yellow coloration with pinkish, brown, or purplish spots and lines.


The moth has a wingspan ranging from 8 to 17.4 cm. Caterpillars can reach up to about 10 cm in length.


The moth can be found in deciduous forests, suburbs, and urban areas, wherever their larval host plants are available.


Caterpillar: Larvae feed on a variety of trees, including pines, oaks, maples, and sweetgums. Moth: Adult Imperial Moths do not eat. They lack functional mouthparts and do not feed during their brief adult stage.


The lifecycle of the Imperial Moth consists of the egg → caterpillar (larva) → pupa (inside an underground chamber) → adult moth sequence. Adults live for only about a week, just long enough to mate and lay eggs.

Defense Mechanisms

Caterpillar: The bright colors and spines of the caterpillar serve as warning signals, indicating that it might be toxic or unpalatable to potential predators. Moth: The moth’s bold pattern can serve as camouflage, allowing it to blend in with leaf litter or bark.

Ecological Importance

Imperial Moths contribute to their ecosystems as pollinators (though to a lesser degree than some other moths due to their lack of feeding in the adult stage) and as a food source for various predators.

Conservation Status

The Imperial Moth is not listed as endangered or threatened. While still common in some areas, its numbers have reportedly declined in parts of its range.
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