A few minutes before the caterpillar pupates, it starts to move in an accordion or concertina motion.
At this point, stay close! The skin will split just behind its head and it will
continue to move and work its skin up toward its feet. Look at the following photos.
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The black cremaster must be slipped out from underneath the skin and grab onto the silk mat the caterpillar is holding onto.
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A closer look at the cremaster and silk mat.
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