Grass spiders, also called funnel weaver spiders (family Agelenidae) make flat or cup-shaped sheet webs with a tunnel at one corner that they hide in. The webs are not sticky, but the spiders can move very quickly on them -- dashing out of the tunnel to grab prey that walks on their web.
Phil Myers (photographer; copyright holder), Museum of Zoology, University of Michigan-Ann Arbor
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