3) Larval Stage- GrowthNewly hatched caterpillars eat as much milkweed as possible- probably 20-30 leaves on average. Milkweed contains a toxic alkaloid that would kill most insects. However, Monarchs have adapted to ingesting the alkaloid and in fact become toxic to would-be predators.
Photograph by John OwensAs larva, Monarch caterpillars grow at different rates, depending mainly on temperature. All Monarch caterpillars, however, go through five different “instars” or molts, before they become a chrysalis. Each time, they will shed their exoskeleton (including the exterior of their head) to
make room for their rapidly growing body. Their old skin quickly becomes a nutritious meal.
Monarch caterpillars have 12 simple eyes to help them see.
