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Nature's Mating Game: Great Blue Herons of Clark County Professional Review and Guide
"Hundreds of long-legged great blue herons gather in their “heronries,” or communal nesting areas, to perform their courtship rituals. Flocks of sandhill cranes, Canada geese, and tundra swans add to the spectacle. Herons move between Shillapoo Wildlife Area, Ridgefield National Wildlife Refuge, and the Sauvie Island Refuge in Oregon. They are most active for two hours after sunrise and two hours before sunset; visit the heronry in late afternoon for best light."
--Sunny Walter & Janet O'Mara, Washington Nature Weekends (Falcon Guides).
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