At present, the researchers found that archaeopteryx has 4 wings instead of two wings of the new evidence, said a research team from China, ancestor of birds flying more like a biplane, legs wings can provide a driving force for the second time.oakley outlet
Research team analyzed 11 samples of bird bones from 150 million to 100 million years ago, which ultimately evolved second pair of wings can be very effectively using the legs to control flight. China's Zheng Xiaoting of linyi University (transliteration) fossil specimens of birds in different delivery Tianyu Museum of nature in Shandong province.
11 samples of bird bones from the 5 species of birds, they are quite strong-physical larger than crows, but slightly smaller than the Turkey. Recently, some fossils indicate that some dinosaur species in the forelimb and hind limb long large feathers, but until now have not found evidence of birds have four wings, even including the recent extinction of the species.cheap oakleys
Zheng Xiaoting and colleagues analyzed the fossil birds of the Shandong Tianyu Museum of nature, identification found that 11 species of ancient birds long feathered the hind legs. It is learnt that the feathers of modern birds have two types: overriding physical outer leaves feathered; under the leaf-like feather fine hair-like feathers.
Research team found a type of blades feather wings, save on fossil specimens of hind limbs of birds in each, the finding means that formed Wings wings wings with four ancient bird, at the same time, their hind limbs, lost their feathers in the process of evolution. But some experts questioned the findings, claiming that the feathers on the hind legs not for flight, but mated to show off part of the show.cheap oakley sunglasses