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We've recently been finding lots of house spiders (Tegenaria sp.) at home - 'tis the mating season I believe. We've been putting them outside, but each evening another one or two usually appear. I'm wondering if these are different individuals or the same ones which have managed to find their way back inside. I was thinking of marking them with something and nail varnish sprang to mind, but I wasn't sure if the chemicals might interfere with their pheromones or damage the spider in some way. Does anyone have any idea if marking them would impact them negatively?