Larva to Pupa > Larva changes color

Some last instar caterpillars will change color as a cue that it has finished eating (or soon will finish eating) and seek a spot to either diapause or form a chrysalis. Sometimes this color change goes from the background color of their host plant (green) to a a more earthtone shade (brown) similar to the likely background color of where they will diapause or pupate.

Please note that most of these thumbnails do little to illustrate these differences. Please click on any image to start slide show to see the full images.