Don't forget black widows.
Worst crawl job I did was a rewire crawling all the receptacles from below. I'd got all the boxes popped out and the holes trimmed for new boxes and had my wife standing by to catch the wires as I pushed them up.(she was actually reading a book and would have been fired if I were paying her)
As I crawled to the first location I noticed big fat black widows were EVERYWHERE!!! Went and got some bug spray and breathed a lot of it trying to get that one done.
Vince