Cottonmouth (Water Moccasin) Snake Facts and Information

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Cottonmouth snakes, known by their scientific name, Agkistrodon Piscivorus, and sometimes referred to by the common names of water moccasins or black moccasins, can be incredibly dangerous if they are in or around your home. Luckily, this venomous snake species is usually only found near bodies of water, but if you happen to come across one, it’s best to know as much about them as you can.

Knowing how they live and what they look like can help you avoid them and keep an eye out for them if you live in an area where they’re prevalent.

In this article, you’ll learn facts about cottonmouth snakes, including their:

  • Appearance
  • Size
  • Region
  • Habitat
  • Diet
  • Behavior
  • Reproduction
  • Venom

Having as much information as you can get about these snakes can help you be prepared if one or more of them make their way onto your property.

Reviewed By:
Ed Spicer

Ed has been working in the pest control industry for years helping 1,000's of homeowners navigate the world of insect and rodent management. He manages Pest Strategies now helping homeowners around the world!

Table of Contents

    Facts About Cottonmouth Snakes

    Cottonmouth snakes get their name because the insides of their mouths are a bright white color that’s very prominent when open. They also have many other characteristics that are easy to recognize and can help you know what you’re dealing with if you see one.


    Aside from their characteristic white mouths, cottonmouth snakes can also be identified by their vertical pupils and dark stripes next to each nostril. Their bodies are wide and muscular and are covered in ridged or keeled scales. They also have blocky heads and large jowls. It can be difficult to identify a cottonmouth snake based solely on its coloring, and they range in color from dark brown or black to olive and yellow. Younger cottonmouths will have bold, striking patterns and bright yellow tail tips, but these tend to fade as the snakes age.


    Cottonmouths are fairly large snakes that should be easy to see if one crosses your path. They can grow to be between two and four feet, but in areas of the United States that are located further south, cottonmouths have been found that are upwards of six feet in length. This helps differentiate them between the smaller, non-venomous water snakes common in the same areas that cottonmouths are.


    Cottonmouth snakes are native to North America and can be found from the midwest to the southeastern United States. They’re especially common in states like Alabama, Virginia, Texas, Oklahoma, and Georgia, where the weather is wet and warm. There are a lot of small bodies of water where they can hide and find food.


    Cottonmouths are aquatic snakes and thrive in areas that have permanent, slow-moving water sources. They live in regions with many aquatic wetland areas like marshes, swamps, ponds, and streams. If you’re in an area with a lot of brackish water or drainage ditches, the odds are good that cottonmouths will be living there.


    Adult cottonmouths have a varied diet, including insects, fish, baby alligators, amphibians, and small mammals. They have even been known to eat other, smaller cottonmouths that share their same territory. They’ll strike their victims with a venomous bite, and if they don’t succumb right away, the cottonmouth will track them until they do. Because it is a pit viper and has facial pits on the sides of its nose, the cottonmouth can sense body heat using infrared and hunt in the dark when most other animals can’t.


    Cottonmouth snakes are known for being fairly aggressive and standing their ground when threatened. They’ll gape their mouths and reveal the bright white interior that gives them their name as a threat display. One of the best ways to know if you’ve come across a cottonmouth or a less dangerous water snake is to look at how it’s swimming. Cottonmouths tend to swim on the water’s surface with their bodies about halfway submerged, whereas water snakes will swim under the water. If you can see a snake on the surface, the odds are good that it’s a cottonmouth.

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    Cottonmouth snakes mate during the spring in April or May. The males lure females by waving their tails and slithering around either on land or in the water. This is when the males will be the most aggressive and territorial, so you must keep a sharp eye out during these months if you live in cottonmouth territory. Females have a gestation period of about five months and give birth once every two or three years. They will bear litters of 10 to 20 live young every time. Since juvenile cottonmouths go off on their own as soon as they’re born, most of them don’t live to adulthood and are eaten by other, larger predators.


    The venom that a cottonmouth snake delivers is hemotoxic, meaning it causes swelling and necrosis in the blood cells. Because of this, it’s possible to get gangrene and other complications from a cottonmouth bite, even though it’s less venomous than a rattlesnake. For the most part, a cottonmouth bite won’t kill a healthy adult, but it can cause severe complications if you’re bitten by one and don’t get treatment right away. They can also deliver dry bites, which don’t deliver any venom, but it’s impossible to know if that has happened when you’re bitten. It’s best to treat any snake bite as if it was venomous and get medical attention as soon as possible.

    Cottonmouth snakes mate during the spring in April or May.

    The males lure females by waving their tails and slithering around either on land or in the water.

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    Protect Yourself From Cottonmouth Snakes

    Knowing as much as you can about cottonmouth snakes can help you protect yourself and your family if you live in an area where they are common. Knowing about their behaviors and venom can help you make the right moves if you see one or are bitten by one, and it can also help you avoid them in the first place.

    If you have a small body of water on your property with a cottonmouth snake infestation, getting a professional wildlife handler to take care of it is essential. They’ll know how to safely remove the snakes and humanely relocate them to the wild where they belong. This is by far the best course of action to protect yourself, your pets, and your family.

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