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Most deadly predator in the world - it is an ordinary dragonfly - VIDEO PDF Print E-mail
Friday, 12 December 2014 10:10


 

American researchers from the Howard Hughes Medical Institute argue that the most deadly predator - the shark is not strong or fierce lion, and the an ordinary dragonfly. Winged insect catches more than 95% of production pursued, making it twice as successful great white shark and four - the king of the jungle.

To catch prey moving through the air, dragonfly, in fact, rely on the same mechanisms as catching a ball man who, anticipating the trajectory of the ball, prepares the body and hands to catch it in the air.

Previously, it was believed that dragonflies catch their prey without any intellectual skill was simply copying all the movements of production (flies, mosquitoes, wasps, bees and other small insects). Now, however sophisticated laboratory experiments and observations of the movements of huge dragonfly eye during the chase showed dragonfly anticipate the trajectory of his victim and fly in the same direction, with the body and head of a predator move independently.

Leonardo and his colleagues found a tiny blob-reflective markings on the head, wings and back of the insect, which allowed the camera to capture ultravysokoskorostnym track the movements of the head and trunk of dragonflies in flight. Researchers watched as predators pursue fruit flies and artificial "prey" 2 millimeters in diameter.

After analyzing the video, scientists realized that the dragonfly is not just react to the movement of the victim. Instead, they constantly adjust the orientation of the body, even when the trajectory of the production does not change. This is due to the internal representation of a dragonfly on his body, which adjusts the trajectory of production in a certain way. As a rule, in the end, dragonflies intercept their prey from below, which reduces the risk of detection.

Throughout the process of persecution dragonfly closed visually on your goals, focusing his body and the trajectory of the final interception, rather than copying every little deviation from their prey flight path in the hope that eventually it will be able to catch up.

"Dragonfly orients the axis of his body in the direction of flight of production, with her eyes intently watching the end, - says one of the study's authors, Anthony Leonardo (Anthony Leonardo). - In order to catch their prey dragonfly comes from behind from below."

Experiments show that even if the production of a sudden changes in speed or direction, dragonfly eyes fast again fixed on her and forced to restructure the existing track.

According to Leonardo, forecasting the movement of the victim is characteristic of vertebrates (mammals, birds and fish), but have never before been observed in insects.

The following scientific papers scientist plans to study how neurons are involved in the pursuit of dragonflies and how they send a signal, activating the muscles that are responsible for the direction of flight.


НАЖМИТЕ ЗДЕСЬ ДЛЯ ПРОСМОТРА ВСЕГО СПИСКА НОВОСТЕЙ О НЕОБЫЧНЫХ ЯВЛЕНИЯХ>>>

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