I saw a very large water snake last week in my pond when I was feeding the fish. He came to where the floating pellets were just like the fish. I couldn't tell if he had come to eat the fish or the pellets because when he saw me he ducked under the water. I was hoping someone could tell me what kind of snake it was. He had alternating dark and light bands and was about four feet long. I do not think he was a water moccasin.