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Photo#2998
A.aurantia & web - Argiope aurantia - female

A.aurantia & web - Argiope aurantia - Female
Kennebunk, Maine, USA
July 12, 2003
I watched as she did repeated series of fast push-ups,on 8 legs, 10-12 sets at a time, getting the stabilimentum vibrating so fast ot became a white blur. The performance lasted about 5 min. A few hours later, I watched as she apparently ate the entire web.

Moved

web vibration
I have observed the same web vibration behavior in several Black and Yellow Argiope spiders. If you gently hold a small twig against the spider's back, the spider will vibrate the web while the body holds relatively still, which gives a good view of the "push-up" motion described by Vincent. My guess is this is a defensive behavior to frighten off predators.

 
web vibrattion
I have a video of one doing it because I was standing "too close" while taking photos. I had not touched the web, but my camera flashed and that is when it started.

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