How many breedings will it take to prove it? Slugs don't mean anything a large amount of infertile eggs would probably though. A spider x spider statistically would be what 25% supers? I think there would be a lot of discussion if there was only 75% of spider x spider clutches surviving. I have only done a few myself never saw anything different about them but that is only a small amount for myself. Why would I or anyone else report their findings? I thought most thought of this as a myth.