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It is difficult to distinguish caterpillars of the peppered moth from a twig. The caterpillars not only mimic the form but also the color of a twig. In a new study, researchers of Liverpool University in the UK and the Max Planck Institute for Chemical Ecology in Germany demonstrate that the caterpillars can sense the twig's color with their skin. Caterpillars that were blindfolded changed the color of their bodies to match their background. When given the choice of which background to rest on, the blindfolded caterpillars still moved to the background that they resembled. The researchers also found that genes that are required for vision were expressed not only in the eyes of the caterpillars but also in their skin. [Emphasis added.]Blindfolding a caterpillar: now there's a challenge for a rainy day! They did it somehow, and when they tested their subjects on artificially colored twigs, the caterpillars mimicked them beautifully. A photo (above) shows dramatic color differences in these caterpillars, from near white to near black, all matching the artificial twigs they rest on. That's an amazing trick to do blindfolded. Apparently, "genes that are required for vision were expressed not only in the eyes of the caterpillars but also in their skin." This implies that the caterpillars can sense both light and color through the skin. The eye genes were found expressed in every body segment, sometimes more than in the eyes themselves.


Comment: If there's one feature to rival the high costs of American military tech (e.g., the F-35), it's their poor quality. That's what happens when you have a system of no-bid contracts and a revolving door between government and the military tech industry. When the government is free to spend other people's money (i.e. tax dollars), it goes to favored clients, who are free in turn to charge exorbitant fees for crappy products.