A pair of biologists at Walla Walla University, in the U.S., have developed a way to calculate the energy costs for certain types of animals with color-changing abilities. In their study published in the Proceedings of the National Academy of Sciences, Sofie Sonner and Kirt Onthank measured oxygen consumption rates for multiple octopuses during color changes. A pair of biologists at Walla Walla University, in the U.S., have developed a way to calculate the energy costs for certain types of animals with color-changing abilities. In their study published in the Proceedings of the National Academy of Sciences, Sofie Sonner and Kirt Onthank measured oxygen consumption rates for multiple octopuses during color changes. Plants & Animals Molecular & Computational biology Phys.org – latest science and technology news stories