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4th instar monarch caterpillar

Detailed Description

Monarch caterpillars proceed through 5 instars (i.e., larval stages) before forming a chrysalis, at which point they develop into adults. 4th instar caterpillars spend 1-3 days in this developmental stage, depending on temperature, voraciously consuming their host plant, milkweed (Asclepia spp.).

Sources/Usage

Public Domain.

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