This is what my son (10yr old Max) ran into on his walk in my Dad's "wilderness".
http://images.google.com/imgres?imgurl=http://www.wf.net/~snake/images/mocclog.jpg&imgrefurl=http://www.wf.net/~snake/moccasin.htm&usg=__hxanmjrTSW2A0LIaeBEp-iAc0F4=&h=200&w=299&sz=25&hl=en&start=12&um=1&itbs=1&tbnid=eCmfprJaA3RXoM:&tbnh=78&tbnw=116&prev=/images%3Fq%3Dwater%2Bmoccasin%2Bsnake%26um%3D1%26hl%3Den%26sa%3DX%26rlz%3D1T4GGLJ_en-GBUS290US290%26tbs%3Disch:1