Black Swallowtail Caterpillar- ?5th Instar?

The molting stages (usually 4 or 5) of a caterpillar are called "Instars".
With this Black Swallowtail at each instar stage, it emerges with a different appearence.
If this is the 5th instar, it may be ready to pupate in 10 days to 2 weeks.

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