The spiders

This summer has been friendly to spiders. I have never seen so many around the house before; mostly they hang around in the ceiling corners to catch bugs and procreate with other spiders. What they don't appear to have been doing is catch the flies, who have also been having a good summer; nearly every day a couple of flies buzz around the house and are generally pests. Since there aren't screens in windows here, they fly in all the time through them.