Attack Spiders stopping swallows! We have had the spider up for a week now, and the swallows are not hanging around. We are crediting the spider! The swallows had been attempting to build nests on stucco porch, generally in mornings and early evenings. We would have to hose off porch frequently or sit out there to keep them away. After hanging the spider, the swallows have left us alone. They are still flying around but have not attempted to resume building nests on our porch.