Because the polder area is enclosed by roads, and there is a lot of recreation on the polder paths by walkers, runners and cyclists, the birds in the area have become accustomed to people, and therefore a lot less shy than in other places. Without disturbing them, I can get very close with my telephoto lens. A shelter or camouflage is not necessary. The best time to shoot for me is in the afternoon and evening, when the light is best from behind.
The great thing about birding is that birds are always and everywhere, free and for nothing. And if you get to know an area through and through over time, as a photographer you know exactly where to be and when, for the best chance of a successful photo. Patience is key. If you stay calmly in your place (sometimes for hours!) something beautiful always arises. Every time that I go out birding, I experience something special, without exception.