cottonmouth moccasins.
*the cottonmouth moccasiccasin lives in Southeastern United States from Florida to Texas it is found in pools and swamps' ponds 'streams*they have and hemotoxic venom at breaks down tissues and blood cells the bite is extremely painful and can be fatal but it does not bite humans that much
*they are relatively large 2 to 4 feet long brown and yellow skin and with cat pupils