I posted a blog entry some weeks ago about a green pigeon that had come in to Wild Bird Rescue. We can definitively say the bird was dyed. You can still see a little green on the tips of the wings still, but most of the rest of the feathers have molted and been replaced.
The good thing is that the bird's neurological symptoms are starting to subside. A few weeks ago, the bird's head was twisted sideways much of the time, especially when he was stressed. He was also still stumbling on occasion. He isn't 100% yet, but he is much better and may be releasable soon. I don't know why people do such things to their fellow creatures. If it wasn't for Wild Bird Rescue, this bird would definitely have died.