It's a baby diamondback, about eleven inches long. I just saw it lying along the baseboard next to the back door. At first I thought that it was one of my kid's toy snakes (she has a lot of them) and bent down to pick it up. When it moved, I think my heart skipped a couple of beats. I was able to capture it alive and put it in my daughter's bug vault. It's late, so I'll call animal control in the morning. Man, this thing is mean! Whenever I put my finger up to the glass, it strikes repeatedly. It vibrates its tail in contempt, even though it's too young to actually have a rattle. It tracks my every movement with a wary hatred that is deeply disturbing, despite its diminutive size. It coils in the corner, waiting for me to make an appearance near its chamber window so it can strike suddenly. We've named it "bin Laden"