does anyone know what kind of spider this is?

San Francisco, CA

and is it poisonous?

info would be greatly appreciated!

Thumbnail by hola874
(Zone 7a)

By definition, all spiders are venomous, in that they inject venom when they bite. Not all of them are dangerous to humans or pets. This spider, I believe, is an Orb Weaver and not dangerous.

http://bugguide.net/node/view/28154

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