Some spiders make elaborate decorations in their webs — circles, zigzags, crosses, or spirals. What purpose do these web decorations serve?
Ask Smithsonian: How Do Spiders Make Their Webs?, At the Smithsonian
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To decorate the web or not?”
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Schematic representation of the web of Argiope keyserlingi. a
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Why Spiders Decorate Their Webs