Please what could this spider be? A brown recluse? Wolf spider?

Ok actually there are 2 spiders outside my kitchen window. They have built a very intricate web. They look identical in pattern except one is slightly bigger. They are very round looking, their backside is large and sleek (no hair) and has a distinctive pattern on it...its tan colored with two dark brown lines down the sides that have sharp pointed ends, and two dark brown diamond shapes in between the lines, one above the other. Its legs are tan, its head is brown. They are HUGE like size of a quarter for one and nickel size for the other. They seem to like to hang right next to each other. What could they be? Could they be poisonous? It freaks me out.