I found a big black widow and put it in a jar in the reloading shed to see how long it would live without food. Always wondered about that, seeing as how they typically live in dark secluded spaces that don't seem to me to have much in the way of food (this one had been well fed as it was inside one of my beehives, which might be another reason I wanted it to starve to death). Anyhow, I had a pint jar with a screened top I put her in and set it on a shelf. Somewhere along the line it had spun a nest and laid eggs, and several weeks later I had hundreds, if not thousands of little tiny black widow spiders exploding out of the jar (serves me right). I hosed down the area with brake cleaner and haven't seen another one since then, this being a couple of years ago.
Interesting fact is that the black widow spider, while it does not spin an organized web like weavers do, the silk is much, much stronger than most spider silk. I have heard of it being used as crosshairs in early scopes. I can immediately tell a black widow web by how strong the silk is.