Okay, so about this snake... You grabbed it with your hands? I hate snakes. I don't think rat snakes are venemous, but I figured it would still bite you and hurt. You just reached out and grabbed it? Wow!
I heard that same little song "bok bok bok bok BA-GAAA" and went running out the other day. Turns out it was just my indoor cat who had gotten out, and was standing there checking out the chickens. They did NOT like the cat. But it was good to know they sound the alarm so I can come check it out!