We have now (DC area)

Carolina wren
Carolina chickadee
red-bellied woodpecker
white-breasted nuthatch
downy woodpecker
mourning dove
cardinal
white-throated sparrow
house finch
purple finch
goldfinch
junco
tufted titmouse

maybe a few more

And I have a few questions.

We used to get both red-breasted and white-breasted nuthatches. Could the loss of the red-breasted ones be due to global warming? (they like it cooler)

Also, I thought the juncos were "slate-colored juncos". Never heard of "dark-eyed juncos".
Is that a species caused by interbreeding or something similar?