Black Swallowtail caterpillar

The pupae may be green or brown, but not depending on surroundings or the background on which they have pupated. The color of the chrysalis is determined by a local genetic balance that ensures the majority of pupae will blend in.[9] Note that a section of the green pupae will turns a much darker green at the very end of the pupae stage. This color change occurs a few hours to a full day before hatching.[9]