Monarch Caterpillar

Natural Habitat

You'll find Monarch caterpillars wherever milkweed plants grow. This includes meadows, gardens, fields, roadsides, and open areas across North and South America.

Diet & Feeding

Monarch caterpillars feed exclusively on milkweed plants (Asclepias species). The toxins from the milkweed are stored in their bodies, making them unpalatable to predators.

Behavior Patterns

Monarch caterpillars spend their time eating milkweed leaves to grow. They go through several instars (growth stages) before pupating into a chrysalis. After about 9-15 days, they emerge as monarch butterflies. The adult butterflies are known for their epic annual migration.

Risks & Benefits

Benefits: Monarchs are important pollinators as adults. As caterpillars, they are a vital food source for some predators, but more importantly, their presence indicates healthy milkweed populations, which are crucial for the monarch's life cycle. Risks: For humans, there are no direct risks. For milkweed plants, heavy infestations of caterpillars can defoliate them, but usually the plants recover.

Identified on: 8/28/2025