catching spiral

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In the orb webs constructed by orb-web spiders (Araneidae), the sticky thread that catches prey. Having built the basic frame and radii of her web, the spider moves outward from the hub, spinning an auxiliary spiral as she goes and attaching it to the radii, until she reaches the outer periphery. She then retraces her steps, using the auxiliary spiral as a guide for laying the sticky catching spiral and removing the auxiliary spiral as she goes, until she reaches the hub.

Subjects: Zoology and Animal Sciences.

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