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Great Blue Heron taking a leisurely stroll near the golf course next to the nature trail by the bay. The great blue heron are able to hunt day and night, thanks to their excellent vision. It's sometimes said that they need bright moonlight for nocturnal hunting, but the high density of rod type receptors in their eyes give them excellent night vision. I have seen them fishing during the day and also in the evening. It's one of the most widespread and familiar waterbirds in the Pacific Northwest. It is the largest heron in North America, standing approximately four feet tall.