"Here we have an example of a wolf spider. These are typically pretty fast runners, but right now this one is affected by an insecticide. They'll set up camp inside the weep holes. That's the gap between the bricks that is established by the builder let moisture out of your wall. You can see his fine, little threads of web in there. Problem is often times they lay their eggs and their baby spiders inside the walls and then you see them inside your house."