Milkweed Tussock Moth: A Monarch Mimic on Milkweed

A gardener found colorful caterpillars on tropical milkweed and couldn't identify them. They were milkweed tussock moth larvae (Euchaetes egle). Like monarch caterpillars, they sequester cardiac glycosides from milkweed, making them toxic to birds. Their bold orange, black, and white tufts advertise this defense—no camouflage needed.

The expert praised David Wagner's Caterpillars of Eastern North America as an invaluable ID resource. These caterpillars are harmless to the garden and support biodiversity. If milkweed is grown for monarchs, tussock moths are a bonus sign of a healthy ecosystem.

Comparison:

• Monarch: Smooth, striped, no tufts.
• Milkweed tussock: Hairy with prominent black, white, and orange tufts.
• Both: Feed exclusively on milkweed; toxic to predators.

Welcome both species—they coexist peacefully.