I took these photos in Beeri nature reserve, Israel:

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I took these photos in Beeri nature reserve, Israel:

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How large are these? I think maybe they are grass or sod webworms.
The photos make them look bigger but they are only about 10mm long.
Well Nirvana, there is a strong possibility that may be what they are. Are there dead patches in the grass?
I agree. There are not a lot of gregarious species that feed on grass like that. Here's a link
sod webworm
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