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Not a single great egret chick survived to fledge from the 32 nests built during the summer at Audubon Canyon Ranch’s Bolinas Lagoon preserve, where they lay their eggs in redwood trees whose tops are rounded from decades of nesting. Scientists believe raptors, including a growing population of bald eagles, may have spooked some birds into other nesting sites and pillaged the young of others.    David Briggs