U.S. Black Widow Spider, poisonous and dangerous. (also upside-down) << This spider actually seems to be a Red Back spider with the markings on it's back. They're easily confused with Black Widows due to the extremely similar coloring. ~Riley Arachnid
Black-and-yellow Argiope. They come in so many colors and reach impressive sizes! They create vibrate webs when they feel threatened. The ziggy zag pattern in their web is their "shady porch" in the hot summer sun.