It does happen sometimes. I just happened to get this photo while I was photographing butterflies at the St. Louis Zoo:
This is a female Red-Legged Honeycreeper. If you click on the link you will see that the male is blue. They are very beautiful birds. I had been taking a photograph of a nearby butterfly and I had my camera on a tripod when I got this shot. Luckily she held still for just a moment. All my other shots are blurry, but I got this one! I cropped this photo in Aperture but I didn’t do any other post-editing.