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You know it depends on what you are after and where you are at. There are some places where there are TONS of birds. If I'm right, the ops pics are from ridgefield, a favorite place of mine to visit as well. It's a wildlife refuge full of tons and tons and tons of birds. It's not a modern creation, it's been a crazy wetlands for a longggg time. Lewis and Clark passed through it and could not sleep because there were so many birds (too loud!). Obviously the nutria pictured are an invasive species though.
No need to camo up and sneak around for great pics of herons / and bitterns (hey the bitterns freeze and you can literally walk almost close enough to touch them if desired). The smaller birds can be a bit more skittish, just depends. The Kingfishers, yeah, you'll never get close to them without a blind! Ridgefield has a few different areas. One is an auto tour you can drive around--your car makes a surprisingly good blind, I'm not sure why, maybe they are just used to it. Other areas you can hike around. I usually do both the auto tour and a few miles of hiking when I visit. There are blinds you can use or you can set up your own. You can kayak or canoe around...etc.