An exquisitely preserved Archaeopteryx fossil has delivered fresh insights into how the earliest birds first took flight 150m years ago.
The fossil is the first Archaeopteryx in which scientists have been able to identify specialised wing feathers that would have made flight possible. These tertial feathers on the upper arm bone create a smooth aerodynamic line from wing to body and are not seen in feathered flightless dinosaurs that existed alongside the first birds, suggesting that this was a crucial evolutionary change required for lift-off.
