Oberhausen: 12 days old eyases

The eyases in Oberhausen are growing very fast. They are 12 days old now. The chicks are beginning to sit upright on their bottom with their enormous feet in front of them. But most of the time they lean on eachother. The very beginnings of wing feather development are also seen around this time. The primary flight feathers are the first to grow. The feathers grow inside a shaft and these will become more and more visable the upcoming days along the edges of the winghand. Next are the secondary flight feathers and tailfeathers. The chicks will start preening as well, they do that by instinct.
The eldest chick in Oberhausen has discovered it has wings, and is flapping away.