A few exceptions include the rattlesnake, coral snake, water moccasin and copperhead. Most poisonous snakes have slitlike eyes. Their heads are triangular, with a depression or pit midway between the eyes and nostrils on both sides of the head. Some nonpoisonous snakes, however, also have slitlike eyes.
Water moccasins have a whitish, cottony lining in their mouth.
Coral snakes have red, yellow and black rings along their length. To reduce your risk of snakebites, avoid picking up or playing with any snake unless you are properly trained. Immobilize the arm or leg that was bitten and elevate it. Don't cut the wound or attempt to remove the venom. Seek medical attention as soon as possible, especially if the area changes color, begins to swell or is painful.