Among the birds are often a male of various types using their bright plumage to attract females. Great Australian bowerbird was the most creative in this issue: in order to win the heart of a potential partner, he enjoys the art of optical illusions, as recently reported by the researchers.
In part, the architect, part magician, the Australian bowerbird constructs a complex of bars arched structure resembling a gazebo. Then he strategically places fruit plants, shells, bones and rocks outside so that they appear larger or smaller, or simply more interesting for the female, which it deems suitable match.
When the female enters his arched structure, the male with his beak, takes small colored pieces of glass, its available in the reserve, and lead them before the eyes of your partner, using a series of optical illusions to keep her attention, as shown by observations published in the journal Science .
The optical illusion is that the true size of objects is affected by the distance at which they are located. For example, large objects that are far away from the viewer have the same dimensions as small items placed much closer.
"If the female watches for a long time," focus ", bowerbird bypasses her from behind and begins the process of pairing" - said John Endler (John Endler) from Deakin University in Australia news agency AFP. All that is required this "magician" is a few minutes of undivided attention to your partner as an added Endler. "Females are watching the actions of the males before mating 1-12 minutes, but more often" prelude "lasts no more than two minutes."
If the lady does not like the idea, she chooses a male without delay, with a higher level of mastery of an optical illusion, as reported by Endler, who guided bird watching with a hidden camera.
During a long observation, he found that over competitive designs males sometimes break their comrades in such a way to reduce the chances of a competitor on the eve of a potential mating ritual. Affected rivals have a mad rush to build a new "arbor" to continue in the race by the beginning of a new day.
Large Australian bower birds are probably the unsurpassed "illusionists," but that’s how the researchers note, is not the only bird species possessing this skill. Missel, gray parrots and pigeons are also used by the optical illusion during mating.