Where did my birds go? I live in the mid-Atlantic (inland northern Virginia) and until a few days [View all]

[Flaxbee]

ago, my feeder was continually mobbed. I'd refill twice a day. I use Audubon blend that costs a freaking fortune, but the birds are worth it, and they provide endless hours of kitty-tv for my felines on the other side of the windows.

Anyway, when it got kind of hot and sticky here earlier this week (not uncommon for this area) almost all of the birds seemed to go away. There is still a random chickadee or two, and a few cardinals, but the house finches and titmouses are just gone. Gone.

Where did they go? Is it seasonal? I checked the feeder - it looks fine, no mold or mildew (rarely gets wet - is hanging on the porch under the roof). I have done nothing different.