Through the evolution the blue marks Outchl were equipped with a very thin skin, as well as a blue glowing dye film, which is under the skin. The slightest contact gets the Blue marks Outchl bruised. The irony of the fate has it, that the Blue marks Outchl were equipped with much to large feet and bad eyes. Since the bruises have an extraordinary pretty blue glow the Blue marks Outchl are very popular as party lighting. Several tests have shown that the bruising doesn't hurt the Outchls, so even more amazing is their amusing sqeals, which remind strongly of a broken party favor.