Emerald is dropping feathers all around the run. There are lots of feathers under her roost spot each morning.
Her under feathers, the one on the left, now have a lot of white on them. Her outer feathers, the one in the middle and on the right, are black with an emerald (hence her name) and purple sheen.
As she is getting older her under feathers are more streaked with white. I think it is like us getting grey hair as we age. Emerald has more white streaks on her feathers each year. I find this quite interesting.
She is still a beautiful girl.