The water moccasin (Agkistrodon piscivorus), also known as the cottonmouth, is a venomous pit viper native to the southeastern United States. This snake is infamous for its threat display—opening its mouth wide to reveal a bright white interior, hence the nickname “cottonmouth.” Though feared for their venom, water moccasins typically avoid human interaction and only bite as a last resort.As members of the pit viper family, they have heat-sensing facial pits that allow them to track warm-blooded prey even in total darkness. Their scientific name means “hooked-tooth fish-eater,” referring to their aquatic diet and dangerous bite.Cottonmouth (Agkistrodon piscivorus) flashes its bright white mouth in the Shawnee Hills National Forest of southern Illinois.
Where Are Water Moccasins Found?
Water moccasins thrive in warm, humid environments and are most commonly found in or near bodies of water. Their range includes:
Southeastern Virginia through all of Florida
Westward into Texas, Oklahoma, and parts of Indiana
In Georgia, they are concentrated in the Coastal Plain but are rarely found in the Piedmont and northeastern regions, particularly west of Atlanta. Still, climate and environmental changes can shift these territories, so caution is always advised.Habitats include:
Slow-moving rivers and streams
Swamps and wetlands
Lakes, ponds, and reservoirs
Retention basins, roadside ditches, and marshy canals
Occasionally in saltwater bays and brackish estuaries
Despite their aquatic reputation, water moccasins can venture far from water and have been spotted in wooded areas, grassy fields, and even residential yards.Cottonmouth Snake (Agkistrodon piscivorus)
How to Identify a Water Moccasin
Being able to differentiate a water moccasin from a non-venomous water snake can prevent unnecessary fear—and potential danger. Key features of cottonmouths include:Size & Shape:
Adults typically range from 2–4 feet long, with some reaching up to 6 feet.
Thick-bodied with a short, blunt tail
Color & Markings:
Juveniles: light brown or tan with dark crossbands and a yellow-tipped tail used to lure prey
Adults: darker in color, often appearing solid black or brown, though faint banding may be seen up close
Head:
Triangular, blocky head with a noticeable distinction from the neck
Dark vertical stripe running through the eye
Eyes & Pits:
Vertical pupils (vs. round in non-venomous snakes)
Heat-sensing pits between eyes and nostrils
Mouth Display:
Wide open mouth with stark white interior shown as a defensive warning
Cottonmouth Behavior and Habitat
Water moccasins are semi-aquatic and equally adept at swimming and slithering on land. They can be observed basking on rocks, logs, and roads near water.Behavioral Traits:
Generally solitary except during breeding
Monogamous during mating season
Most active at night but can be seen during the day in warm conditions
Use heat-sensing pits to track prey with precision
They often stay hidden beneath logs, rocks, or thick vegetation near water’s edge. While many harmless water snakes flee when threatened, cottonmouths tend to stand their ground.When cornered, they may:
Emit a musky, foul-smelling secretion
Vibrate their tails like a rattlesnake
Flash their open white mouths
Strike if provoked
What Do Cottonmouths Eat?
Water moccasins are carnivorous and opportunistic feeders that hunt both in water and on land. Their diet includes:
Fish
Frogs and tadpoles
Salamanders
Rodents (mice, rats, squirrels)
Birds and bird eggs
Small reptiles and even baby alligators
Carrion (dead animals), unlike many other snake species
Cottonmouths subdue prey using venom, then coil around it to secure it before swallowing whole. They are one of few snakes capable of biting underwater.
Water Moccasin vs. Non-Venomous Water Snakes
Several species of non-venomous snakes resemble the cottonmouth. These include:
Eastern Green Water Snake (Nerodia floridana)
Brown Water Snake (Nerodia taxispilota)
Red-Bellied Water Snake (Nerodia erythrogaster)
Banded Water Snake (Nerodia fasciata)
Comparison Chart:
Feature
Water Moccasin
Non-Venomous Water Snake
Body Shape
Thick, heavy
Slender, elongated
Head Shape
Blocky, distinct neck
Narrow, blends into body
Pupil Shape
Vertical slit
Round
Behavior When Threatened
Mouth open, coiled, fangs shown
Hissing, striking, head flattening
Swimming Position
Floats high in water
Lower in water, head only visible
While some water snakes mimic cottonmouths for protection, they lack venom and the characteristic white mouth display.
What to Do If You’re Bitten By Water Moccasins
Water moccasin bites can cause severe tissue damage, but fatalities are rare with timely treatment. Symptoms may include:
Intense pain, swelling, and redness
Blistering and tissue death (necrosis)
Nausea, vomiting, or diarrhea
Low blood pressure, fast heart rate
Muscle twitching or numbness
Emergency Response:
Stay calm; limit movement
Call 911 or head to the nearest ER
Remove tight clothing/jewelry near the bite
Keep the affected area immobilized and level with the heart
Do NOT:
Attempt to suck venom
Apply a tourniquet or ice
Drink alcohol or take painkillers
Cut the wound
Hospitals in snake-prone areas stock antivenom (CroFab), which is highly effective if administered promptly.
How to Prevent Water Moccasins in Your Yard
Living near water increases your risk of encountering cottonmouths, but you can reduce their presence by:
Eliminating brush, tall grasses, and wood piles
Keeping lawns trimmed and clutter-free
Sealing crawlspaces and under-deck areas
Installing fine mesh snake-proof fencing (30″+ high, anchored to ground)
Removing standing water sources and bird feeders that attract prey
Routine yard maintenance is your first line of defense.
Do Snake Repellents Work?
Most commercially available repellents have minimal or no impact on water moccasins. These products often:
Contain sulfur, naphthalene, clove oil, or cinnamon
Must be reapplied after rainfall
Are unsafe to use near bodies of water (as per product labels)
Important: Always read product labels carefully. Many state clearly that they are ineffective for cottonmouths or not for use near aquatic habitats.
Can You Trap Water Moccasins?
Trapping adult cottonmouths is challenging due to their size and solitary, ambush-based hunting style. Common trap types include:Minnow Traps:
Small entrance holes may only catch juveniles
Baited with frogs or eggs but rarely successful
Glue Traps:
Inhumane and indiscriminate (may trap birds, squirrels, lizards)
Ineffective outdoors due to dust, rain, and temperature
Professional removal remains the safest and most effective option.
Water Moccasins Indoors: What You Should Know
Though rare, water moccasins can enter homes after floods, hurricanes, or heavy rain. They are more likely to be found in:
Garages
Sheds
Basements or crawl spaces
If you suspect a venomous snake is inside your home:
Do NOT approach or attempt removal
Evacuate the area and keep pets away
Call a professional wildlife removal team immediately
Why Choose Nextgen Pest Solutions for Snake Removal
At Nextgen Pest Solutions, we provide expert removal and relocation of venomous snakes, including cottonmouths. Our licensed professionals:
Accurately identify venomous and non-venomous species
Use humane, effective snake capture methods
Offer exclusion strategies to prevent future intrusions
Whether you live in Florida, Georgia, or other cottonmouth-prone areas, do not take chances with venomous snakes. Contact Nextgen Pest Solutions at the first sign of a snake threat.Your safety is our priority. Let us handle your snake emergency with care and expertise.
