Well, here's an update.
The parrots have been hanging on a curtain rod, near a window, for the past month.
Took them down for a Farmer's Market event and discovered the coloring on the side of the parrots facing the sun was faded.
I had colored them using my wife's liquid food coloring.
I never imagined the sun would do that, but it did. The fading was not severe, but noticeable. So I guess, yeah, that qualifies as severe.
Learning has taken place.
So . . . can anyone recommend any coloring agents out there that are UV resistant?