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I changed my site structure from flat to hierarchical structure.
Also, I don't understand that reference? What do you mean by "black and white critters"?
Have you seen any significant changes in Google rankings and traffic since your recent site-structure alterations? For example, the Google algorithm might suspect that you made the alterations for SEO purposes, and drop your rankings and traffic, at least temporariily, to test for possible reactions on your part that would confirm the suspicion. It could even become a "cat and mouse waiting game" between you and the algorithm, to see whether it can trap you or you can trick it.