Even 4cm is big enough for the small songbirds to fly trough.I have my run split in half so each half has a different support.
The bigger side, the coop itself is my center support. As you can see my fence is pretty low on this side (4') so I have U-posts around the perimeter with tension wire strung around the top, to form a top edge to drape netting on, so there's a head clearance of roughly 6' through the entire run.
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The smaller side I have a pair of cross beams set up about a foot above the top rail, and the netting drapes over that.
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And 2" openings is the "standard" if dealing with hawks/owls, though that does mean that smaller birds such as songbirds can get in. I've had a squirrel climb in as well as a nuthatch that would follow me around the yard. But conversely 2" does allow more snow to fall through, and I think it's cheaper overall than a comparable 1"?
I love it when songbirds fly through the netting into the run to eat from the grains too. It makes me happy to have lots of small songbirds in my garden. We have sparrows, great tits, blue tit, wren, robins and goldfinch (translated by google, didn’t check).
If you use the thin netting or if the bird net isn’t stretched tight the songbirds can get entangled in the netting.
edit: is the right word net or netting?
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