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What is the difference between a water moccasin and a cottonmouth?

Author

Rachel Ellis

Published Jan 11, 2026

Cottonmouth, Water Moccasin – One and the Same

Although many people believe that water moccasins are distinct from cottonmouth snakes, the truth is that they are one and the same. Regardless of what it's called, all subspecies of this snake are venomous but not particularly aggressive.

Whats the difference between a cotton mouth and a water moccasin?

Water snakes are slender compared with cottonmouths, which are thicker and heavier. Water snakes also have longer, thinner tails, and their heads are a similar width to their necks, whereas a cottonmouth's head is thick, blocky and noticeably wider than the snake's neck.

What's the difference between a water moccasin?

Water Snakes, like this Northern Water Snake, have bands that are widest on top, whereas Water Moccasins have bands that are widest on the sides. A Northern Water Snake in a threat posture, with the head flared. A juvenile Water Moccasin swimming.

Can water moccasin bite underwater?

Besides sea-snakes, there are two common snakes that can live in or near water - the cottonmouth (water moccasin) and the water snake. Not only can snakes bite underwater, but water moccasins join a list of more than 20 species of venomous snakes in the United States making them even more of a threat.

Why is a water moccasin called a cottonmouth?

Also known as the water moccasin, the cottonmouth derives its common name from the white color of the inside of its mouth, which is revealed when the snake gapes to defend itself.

43 related questions found

How long do you have after being bit by a cottonmouth?

Patients presenting after a cottonmouth bite should undergo observation for eight hours post-envenomation. If there are no physical or hematologic signs within eight hours, then the patient can be discharged home.

What's the difference between a copperhead and water moccasin?

Cottonmouth vs Copperhead: Habitat

The preferred habitats of cottonmouths differ from copperheads. Cottonmouths are also known as water moccasins, which refers to their preferred habitats. While copperheads tend to prefer environments that are warm and dry, cottonmouths are usually found near bodies of water.

What do you do if you get bitten by a water moccasin?

Your best bet is to call 911 and try to stay calm. Get away from the snake and, if you can, move your body so the bite is below your heart. Clean the wound and cover it with a clean bandage. Don't put a tourniquet on the bite or try to cut it open and remove the venom.

What to do if a snake chases you?

Yell, clap your hands, and stomp your feet. Call 1300 ANIMAL for advice or contact your local snake catcher to relocate the snake. Other than chasing fast-moving objects and people for the purpose of satisfying the prey drive, some dogs attack people when they run because they are afraid of them.

Are cottonmouth more poisonous than rattlesnakes?

For example, rattlesnakes rattle their tails and coil up, while cottonmouths mimic a rattlesnake's rattle and emit a musk that deters predators. A cottonmouth's venom is also not as potent as a rattlesnake's.

Are all water moccasins poisonous?

But are water moccasins poisonous or dangerous to humans? While they are not poisonous to touch or eat, cottonmouth bites are highly venomous and can kill humans. Their venom is deadly, and their bite can cause severe complications if not treated immediately.

Which is worse water moccasin or copperhead?

Cottonmouth Snake

The cottonmouth (also known as the water moccasin) bite is much more dangerous and harmful to humans than the bite of the closely related copperhead, but rarely leads to death.

Which is worse cottonmouth or copperhead?

Cottonmouth snakes are generally considered to have more potent venom. Copperheads are considered less venomous and there is some controversy as to whether or not bites from copperhead snakes need to be treated with antivenom. Copperhead and juvenile cottonmouth snakes are both brown in color.

Which is more aggressive copperhead or water moccasin?

That's why more people are bitten by copperheads than any other type of snake in the United States, according to the North Carolina State University Cooperative Extension. The bites are painful and cause permanent scarring. Water moccasins are less aggressive, usually attacking only if provoked.

Does sucking venom work?

Myth #2: Sucking the venom out of the wound / snake kits

But it doesn't work. Sucking the venom out can cause the poison to spread to the mouth, and the extractor pumps found in snake kits won't do any better: a study found that one of the most common extractor pumps extracted bloody fluid but virtually no venom.

Can you survive a cottonmouth bite?

Some snakes, however, are venomous, and their bites can be life threatening. These dangerous snakes include the copperhead, rattlesnake, cottonmouth (water moccasin) and coral snake. If you are bitten by a venomous snake, call 911 immediately.

How poisonous is a cottonmouth snake?

The cottonmouth has a powerful cytotoxic venom that destroys tissue and is considered more toxic than that of the Copperhead. The bite symptoms commonly include severe pain, swelling, ecchymosis, and even though deaths are rare, the cottonmouth bite could leave scars and on occasion lead to amputation.

What snake kills the most humans in the US?

The eastern diamondback rattlesnake (Crotalus adamanteus) kills the most people in the US, with the western diamondback rattlesnake (Crotalus atrox) ranking second. However, some authorities believe the western diamondback is responsible for the most deaths.

Are baby cottonmouth snakes poisonous?

Commonly, juvenile snakes produce less venom than adults. However, the cottonmouth develops venom at a young age, and even at just 10 inches long, they can be extremely dangerous.

Are cottonmouth snake bites fatal?

Cottonmouth venom is potent and can be fatal to humans, even though bites are uncommon. Anyone who has been bitten by a cottonmouth (Agkistrodon Piscivorus) must seek medical help right away.

Will water moccasins hurt you?

The water moccasin is not poisonous. It has a reputation as being the most venomous snake in North America, but in fact it is not known to be venomous, and the water moccasin does not bite humans (perhaps because of its aquatic lifestyle).

What snake bite kills the fastest?

The black mamba, for example, injects up to 12 times the lethal dose for humans in each bite and may bite as many as 12 times in a single attack. This mamba has the fastest-acting venom of any snake, but humans are much larger than its usual prey so it still takes 20 minutes for you to die.

What snake looks like a cottonmouth?

Water Snakes

These snakes, like the northern water snake, broad-banded water snake, yellow-bellied water snake and the Mississippi green water snake can superficially resemble a cottonmouth due to their dark, dull coloration, rough scales and the uniform bands around their bodies.

Is a copperhead a water moccasin?

Water moccasins (cottonmouths), radiated rat snakes, Australian copperheads and sharp-nosed pit vipers are all sometimes called copperheads, but these are different species from the North American copperhead (Agkistrodon contortrix). Copperheads are pit vipers, like rattlesnakes and water moccasins.