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Brown Watersnake

Nerodia taxispilota

iNaturalist Wikipedia

A heavy-bodied master of the southern waterways, the Brown Watersnake is most at home sunning on a cypress knee or patrolling the riverbank for fish. Though often misunderstood, this impressive reptile is an essential indicator of a healthy aquatic ecosystem.

0 Sightings

0 Habitats

Quick Identification

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Size

30-60 inches (76-152 cm) in length; large females can occasionally exceed 5 feet (152 cm)

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Colors

Light brown to tan ground color with large, dark brown, square-shaped blotches arranged in a checkerboard pattern along the back and sides.

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Key Features

Large square-shaped dark blotches that do not meet the belly scales
Bulging eyes located near the top of the head
Heavy, thick-set body with keeled (ridged) scales
Dark vertical bars on the labial scales (lip scales)

When You’ll See Them

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Activity pattern Active day and night

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Peak hours 9 AM - 4 PM for basking; after dark for foraging during summer months

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Season March-October

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Diet Primarily piscivorous, feeding almost exclusively on fish, with a particular fondness for catfish. They also occasionally consume frogs and other amphibians.

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Habitat Slow-moving rivers, large streams, cypress swamps, and lakes with abundant overhanging vegetation.

public Geographic range

Where Does the Brown Watersnake Live?

Native to the North American continent, the Brown Watersnake is a signature species of the southeastern United States. Its core range spans the coastal plain and piedmont regions from southeastern Virginia down through the Carolinas and Georgia, covering the entire Florida peninsula and extending west into eastern Alabama. These snakes are intrinsically tied to freshwater systems, meaning their distribution follows the corridors of major river basins and sprawling swamp networks throughout the humid subtropical South.

Basemap © OpenStreetMap contributors

1 Countries

420K km² Range

Least Concern Conservation

US United States

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iNaturalist / Verified observation data

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Behavior

The Brown Watersnake is a highly aquatic and diurnal reptile, famously known for its habit of basking on tree limbs overhanging rivers and swamps. When startled by a passing boat or predator, these snakes will drop directly into the water to escape—occasionally landing in boats by accident, which has led to many a tall tale about "attacking" snakes. In reality, they are non-venomous and generally flee from human interaction whenever possible.

While they are quite docile if left alone, they can be very defensive if cornered or handled. Like many watersnakes, they will flatten their heads to appear larger and may strike or release a foul-smelling musk to deter threats. Despite their somewhat intimidating appearance and large size, they are harmless to humans and play a crucial role in maintaining healthy fish populations in southern waterways.

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Camera Tips

To capture high-quality images of a Brown Watersnake, your best bet is to focus on 'basking architecture.' Look for fallen logs or low-hanging branches that extend over the water in sunny spots. These snakes are ectothermic and spend hours each morning thermoregulating. Mount your camera on a nearby tree or a specialized T-post near the bank, angling it toward the most prominent sun-exposed log.

Standard PIR (Passive Infrared) triggers often fail to detect snakes because their body temperature closely matches the environment. To overcome this, use your camera’s Time-Lapse mode during the day. Setting the camera to take a photo every 2 to 5 minutes between 9:00 AM and 3:00 PM will significantly increase your chances of 'catching' a snake as it moves onto its basking spot.

If you are using a camera with high sensitivity settings, place it low to the ground—about 12 to 18 inches high—along the shoreline or a 'haul-out' spot where the bank meets the water. These are the transit paths snakes use to move between hunting and resting areas. Ensure your camera is in a waterproof housing, as these areas are prone to sudden water level rises after heavy rain.

For night captures, use a camera with 'No-Glow' or 'Black Flash' infrared LEDs. Brown Watersnakes become active hunters after dark in the heat of summer. High-speed triggers are less important than a wide-angle lens, as the snakes move slowly while foraging along the water's edge. Avoid using white flash, which can startle the snake and cause it to dive, ending your photo session instantly.

Frequently Asked Questions

They are primarily diurnal, meaning they are most visible during the day while basking on logs or branches. However, during the hot summer months, they often become nocturnal to forage for fish in the cooler water at night.

If you have a waterfront property, you can attract them by maintaining natural shoreline vegetation and leaving fallen logs in the water. These provide essential basking spots and hunting cover for the snakes.

Their diet consists almost entirely of fish. They are particularly known for catching small to medium-sized catfish, though they will also eat minnows, sunfish, and occasionally frogs.

They can be common in suburban areas if there is a permanent body of water nearby, such as a retention pond, lake, or creek. They are more frequent in areas with less manicured, more natural shorelines.

Look at the eyes and the pattern. Brown Watersnakes have round pupils and eyes that sit high on their head, whereas Cottonmouths have vertical 'cat-eye' pupils and a dark stripe running through the eye. The Brown Watersnake's blotches are square and checkerboard-like, while the Cottonmouth has more pixelated, 'hourglass' shaped bands.

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