Types of Spider Webs

Wasp spider
Some orb-weaver spiders add decoration to their webs: an extra band of silk called the stabilimentum.

This is particularly striking in the case of the wasp spider (Argiope bruennichi). It incorporates a zig-zag of dense, white silk down the centre of its web. What this is for still isn't known, but there are a few ideas.
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