Those teensy flies aren't called "noseeums" for nothing! I'm sure the
spiders are eating something you're just not able to see. After all, the
spiders got in to build nests, so there's some way for outside things to get
it. The webs I find are near lights (more accurately underneath them) and
near doors, windows, or anyplace where there's a slight airflow. As someone
else noted, the lack of natural predators also means that a spider's whole
egg output might survive, leading plenty of offspring to set up shop in
areas that won't produce any food. I found little dead spiders in the
basement inside of RX bottles I had on the bench top. Apparently starved to
death waiting for a meal that never came.
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