A paper publishes by Dakota E. McCoy and collaborators 15 May 2019 shows how the shape of particular scales on the abdomen of peacock spiders makes the particular areas blacker they would be otherwise. The study focuses on Maratus specious and Maratus karrie, but black patches can be found in many other species of peacock spiders. The study found that super black regions reflect less than 0.5% of light in this two species owing to the microscope structures. The authors suggest that like in birds of paradise these black patches make nearby colours appear brighter.