There is a lot of excellent bird photography to be done on cloudy days. Certain conditions lend themselves to certain types of images, and part of being a good bird photographer involves knowing when to not try to do certain things.
On cloudy days, I would concentrate my efforts on shooting songbirds at feeder set-ups, or on other perched situations in which you are able to control the background by re-positioning yourself. Another type of opportunity that can yield great images in overcast conditions would be shooting waterfowl on the water (as opposed to in flight). Or, if able to do some BIF work, try to do that with birds that are flying at eye level, and not aiming your camera at an upward angle. Shooting ducks as they flush from the water's surface would be an example of this.
Some bird photography actually requires complete cloud cover. For example, my Ruffed Grouse drumming log set-ups last spring; they could only be shot effectively if there was a complete overcast. This was because they were being shot in a forest under the deciduous canopy. Sunlight would cause there to be a lot of very hard shadows and a lot of very bright areas with nasty glare off of the foliage. The cloud cover acted as a huge diffuser, which evened out the light and made it possible to obtain excellent images.
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© Tom Reichner [SHARE LINK] THIS IS A LOW QUALITY PREVIEW. Please log in to see the good quality stuff. Other opportunities that often require cloud cover are photographing cavity-nesting birds at their nest hole. Often times, due extremes in topography around the nest tree, one can not position one's self where one would like to be positioned. You often have one spot that you can set up at, and are unable to more to the right or to the left, due to seep slopes, craggy cliff faces, ditches, etc. And the spot that you have to shoot from seldom works well with the direction of the sun. So, in order to get any decent image at all, you have to wait until clouds come in and block the sunlight:
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© Tom Reichner [SHARE LINK] THIS IS A LOW QUALITY PREVIEW. Please log in to see the good quality stuff. Normally, when I see what the weather is going to be like for the day, I then choose what types of photography I will do. If the conditions aren't right for certain types of images, then I don't try to take those images.
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"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".