Imperial Moth Caterpillar: A Harmless Giant Worth Admiring

That 4-inch, quarter-thick caterpillar on your evergreen is the larva of the imperial moth (Eacles imperialis)—a spectacular native species that's completely harmless.

Two Color Forms

Larvae occur in green and orange-brown forms, both with distinctive spiny protuberances. Despite their intimidating appearance, they don't sting or bite.

No Control Needed

Populations are naturally low. Enjoy the encounter—these caterpillars become magnificent yellow-and-purple moths. Their presence indicates a healthy ecosystem.