Mealworms spend most of their lives underground in darkness. Do they respond to color at all? You line a container with four strips of colored paper. One strip is blue and another is red. The other two are green and yellow. Place a mealworm in the center and watch which color it crawls toward first. After many trials a clear pattern appears. Blue wins almost half the time at 49%. The mealworms also tend to return to blue after visiting other colors. One possible reason is that blue absorbs the most light of the four colors. Since mealworms seek darkness they may head toward whichever surface looks darkest.