Resumen de Four wings not better than two for early birds
Before birds could fly on two wings, they had to ditch their training pair. A new analysis of early bird fossils adds weight to the idea that they once had four wings. In 2003, Chinese researchers revealed six remarkable fossils of flying dinosaurs with winged hind limbs. Xing Xu from Linyi University in Shandong province says that when they published that 10 years ago there was some suspicion that the fossil was faked. Since then, more four-winged dinosaurs have been found, but doubt remained about whether they were direct ancestors of modern birds, or just an unusual group of dinobirds that later died out.
