#1 we call "purple finch" around here.
#2 Eastern Goldfinch (probably female)
#3 ?
#4 Tufted Titmouse
#5 ?
National Audubon Society
1. NOT a purple finch, definitely a male House Finch. A Purple Finch would have more color in its wings, plus the color is just deeper and different. I could never tell them apart--until I actually SAW a Purple Finch. Now, I can almost always tell. But many, many people call House Finches Purple Finches.
2. American Goldfinch. I'd say male in nonbreeding color
3. shefjr is right, Brown-Headed Cowbird. Not sure if it's immature or female, but it's definitely a Cowbird.
4. Tufted Titmouse
5. REALLY tough to determine whether a Hairy or Downy from the front like that. Besides the size, mentioned by shefjr, the other really good, consistent identifier to tell the difference is the length of the beak. Downy Woodpeckers have very short beaks; Hairy Woodpeckers have beaks that are nearly as long as their heads. I'm going to say this is a Downy, based on two factors:
--Even though the view is straight-on, that beak looks shortish, and the bird itself looks smaller than what I'd expect from a Hairy (though I don't know the diameter of the branch for scale)
--Downys are far more likely to let you get that close of a look at them. Hairys *tend* to be more skittish and *tend* to stay up higher and more hidden in the trees.