Where do the birds go when it’s hot?

Ok, I have two backyard feeders that I bought on a whim, largely because they were pretty and reminded me of sea glass more than anything else. Since the birds found the feeders and the bath, I’ve been surprised at how entertaining I find them. I suppose I shouldn’t be surprised given all the four-legged critters I have accepted into the house.

Anyway, we have to fill those feeders every day, normally, and they are usually out of seed by noon so that they are fighting over the finch food.

During the hot weather, though, the birds have been gone, and the feeder has been eaten down only by half. At least I think it’s the hot weather–Or else that chubby tuxedo cat the neighbor lets wander around started in on the feeder and the birds have left.

Does anybody know how the heat affects birds?