Male spiders-the peacocks know how to attract females: with dances and optical tricks. What? Microscopic bulges on the outer skeletons of these arachnids make velvety black areas darker than normal black color, manipulating light. This architecture reflects less than 0.5% of the light, said scientists in a paper published may 15 in the Proceedings of the Royal Society B.
What is the secret of the dancing spider?
“Smertelnye spots that can be found near motley and bright colors on the abdomen of the spider, to create the optical illusion that the colors are so bright they almost glow,” says evolutionary biologist at Harvard University Dakota McCoy.
Male spiders sway and shake their bellies painted during a complex wedding ceremonies. Pigments to create red and yellow colors, but blue and purple colors are due to the interaction of light with hair scales.
Black areas on the spiders also contain a pigment. But scanning electron microscopy also revealed a landscape of tiny bumps on the spiders Maratus speciosus and M. karrie. On the contrary, entirely black, closely related to spiders Cylistella have a smooth texture.
Using simulation, McCoy and her colleagues revealed that because of the bumps dark spots look even darker. Curved surfaces reflect and scatter light around it so that it goes out of sight looking females. And bulge acts like a lens, bending incoming light so that it travels a longer path and spend more time on the interaction with light-absorbing black pigment Miladinovi than would be spent, whether the surface is flat.
The luxurious appearance of spiders is reminiscent of birds of Paradise that also use the tiny structures to create ultracare feathers. But those and other animals have developed their skills individually. And this phenomenon may not be so rare. According to McCoy, sorceria shades have with snakes, bugs and other birds.
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