We saw this thing in our garden today. Yikes! I looked it up and its a Black and Yellow Argiope. I was happy to read that it is harmless to humans. The webs grow to be up to 2 feet wide and they eat their webs every night and build new ones every day. They also lay eggs sacks with up to 1,000 eggs. Wow. Why is it that spiders are so creepy?