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Spiders have spinnarets towards the rear of their underbellies. From these openings they pull out threads that solidify due to mechanical stretching of a liquid protein mass inside their bodies.

A week ago I watched an orb spinning spider build its spiral orb web and saw that she climbed to the next rung and with a pair of her legs pulled in the radial thread until she could just reach the previous tangent thread with her longest (front) leg then she fastened the thread from her rear to that radial and climbed to the nest radial spoke.

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13y ago

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