Correct. I believe that Stephan's ID is correct. I was looking at vegetation and listening to the local guides' vocal accents and background bird songs and came up with the same conclusion. (South America) I also noticed that the snake's "bulge" was a threat response (it came, and went at will, like a cobra's hood) and that his body was laterally compressed, suggesting an aquatic and/or abborial adaptation. Good job Stephan, I concur with your ID.
Now where can I get one of these snakes? Awsome. I love his spirit. I admire the birds' spirit even more! If you'll notice, after getting caught twice, the bird takes some time to plan, and comes back for more! I love it. Great video. I had observed similar behavior between So. California ground squirrels Vs. large gopher snakes and gopher snake/king snakes vs. burrowing owls. Quite entertaining, but at the time, there was no such thing as everyone carrying a camera phone, and no digital recorders of any kind. Had to record the experience the old fashioned way < memory.