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Photo#73496
Giant Caterpillar - possibly a Sphinx Moth Larvae

Giant Caterpillar - possibly a Sphinx Moth Larvae
Stone Mountain, Georgia County, Georgia, USA
August 27, 2006
Size: 5 1/2 inches long
it was a vibrant green and when we scooped it up in a container and then put it on the ground to take a picture of it, the color changed to this reddish color.
We didn't keept it, but threw it back in the woods away from the house.

Moved

Definitely a sphinx
and with those blurred white diagonals, could be an Azalea Sphinx, though there are several with a similar look. The color change you saw is common in caterpillars just prior to pupation, as is the wandering that brought it to your attention.

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