We have a very dark House Finch that showed up at our place in Fallon a few days ago and he's been eating sunflower seeds and getting a sugar rush from the oriole nectar. I've never seen a House Finch this dark and it was quite a nice surprise.
You should be able to click on the link below and see the images. If not, please email me and I will send the images to you.
Are House Finches this dark very common? He sure threw us for a loop.