Yes, THAT snake is a cottonmouth. The one in the picture that humblegunner posted is a yellow-bellied water snake. Two different snakes. Look at the jawline of each one. Cottonmouth in the video has horizontal lines along its jawline; like a ‘racoon mask’. The snake in the pic in this thread has a yellowish jawline with clear vertical lines. I can tell very clearly which one is which. I’m not trying to be a jerk - I do know the difference between them, and once you learn it, it is very easy.