- Hi There. Just a question regarding the sizes of the white-tailed spider. I reside in Sydney's South West, and this summer the white-tails have been unusually active in our household. The ones we are seeing are obviously female due to their size but they are HUGE! Most averaging around 15mm body length but some as large as 25-30mm. Very distinctive white-tailed markings, not just the white tip but the dual bands of white as well, cigar-shaped body. Could these be a different species? We are worried with our 10yo daughter here, as we have heard stories of flesh-eating disorders after a white-tailed bite, but have since researched that these are possible unconfirmed species or alternative factors contributing to these cases. We find that the "window spiders", daddy-long-legs and white tails are living together quite happily in our home. We will shortly be getting the house sprayed but are worried due to the large number we have been seeing this summer that there may be a large infestation. Is it possible that the white-tailed spider may "nest"? Thanks.