Spider and are not insect5/29/2023 ![]() The spiders then create an auxiliary spiral to help the radial threads support the spider’s weight as it builds. An orb-weaver begins its web with radial and framework threads using dragline silk, providing a foundation upon which to spiral the sticky catching threads. Their webs are complex nets of strong dragline threads (frame, spokes) radiating out from the center and elastic, sticky catching threads spiraling into the center. We’ll focus on orb-weavers because their webs are the most recognizable. ![]() Many spiders, particularly orb, funnel, sheet and cob-weaving spiders, use this silk to build webs with which to catch prey. These glands secrete proteins that are extruded through spinnerets to produce different kinds of silk. A spider has up to eight eyes, eight legs and seven silk-producing glands in its abdomen. Spiders are invertebrate creatures in the araneae order of the class arachnida in the phylum arthropoda. National Park Service, NP Digital Asset Management System ![]() ![]() In addition, spiders have moveable claws on their feet that grip and release the web’s threads as they walk. Spiders are able to spin sticky and non-sticky silk.
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