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Message: <blockquote data-quote="KnockerNorton" data-source="post: 1685183" data-attributes="member: 66452">Nobody has mentioned culling anything, anywhere on this thread.Indeed they did. And it is a fact that the populations of many passerines boomed during that time. Things like Tree Sparrows and Redpolls reached their population peak, and it's worth noting that when we judge population declines now, we're looking at a starting point of around 1965. At that time, most predators were at a minimum (not just Sparrowhawks). There were other factors at play too, as big landscape changes were underway that beneftted some species. But there was a near vacuum of predators around at that time. I think you should check out who the authors of those studies are, and what the studies are part of. Google a few of the authors and see what else they have published, and I think you might change your perception. You are leaping to conclusions about why those studies were done. It is disingenuous to pass comment on their conclusions and even their motives when you have a lack of knowledge of them.</blockquote>