Green Water Snake
Reptiles Active during the day

Green Water Snake

Philothamnus hoplogaster

A harmless, emerald-hued beauty of the African wetlands, the Green Water Snake is a welcome visitor to any garden pond. Graceful and shy, this non-venomous hunter is a master of camouflage and a delight for backyard wildlife observers.

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Quick Identification

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Size

A slender snake typically reaching 60–90 cm (24–35 inches), with rare individuals slightly exceeding 1 metre.

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Colors

Uniform bright green to olive-green above; underparts are usually white, cream, or pale yellow; lacks the dark spotting found in similar green snakes.

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Key Features

  • Vibrant emerald green body without spots
  • Large, dark eyes with round pupils
  • White or pale yellow belly
  • Slender build with a long, tapering tail
  • Smooth scales with a satin-like texture
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When You’ll See Them

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Activity pattern Active during the day
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Peak hours 9 AM - 4 PM
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Season September-April
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Diet Primarily feeds on frogs, tadpoles, and small fish; occasionally consumes small lizards.
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Habitat Found near permanent water sources, including marshes, riverbanks, damp grasslands, and well-irrigated suburban gardens.

public Geographic range

Where Does the Green Water Snake Live?

The Green Water Snake is native to the southeastern regions of the African continent. It is most commonly found throughout the eastern half of South Africa, extending northwards through Mozambique, Zimbabwe, and Malawi. Its range continues into East Africa, where it inhabits moist savanna and coastal regions of Tanzania and Kenya.

Basemap © OpenStreetMap contributors

8 Countries
4.5M km² Range
Least Concern Conservation
ZA South Africa MZ Mozambique ZW Zimbabwe Malawi TZ Tanzania KE Kenya Eswatini ZM Zambia
Elevation range
0 m1,000 m2,000 m4,000 m
Sea level – 2,000 m
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iNaturalist / Verified observation data
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Behavior

The Green Water Snake is a diurnal hunter, meaning it is most active during the daylight hours. Highly agile and graceful, it is equally at home swimming through garden ponds or climbing through low-hanging shrubs and reeds. Unlike many other snakes that may strike when cornered, this species is exceptionally placid and rarely attempts to bite humans, preferring to flee into the water or thick undergrowth at the first sign of danger.

As a semi-aquatic species, it relies heavily on its camouflage. Its brilliant green scales allow it to vanish against lush garden foliage or aquatic plants. It spends much of its morning basking in the sun to regulate its body temperature before moving off to hunt for its preferred prey of amphibians and small fish.

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Camera Tips

To successfully capture the Green Water Snake on a backyard camera, focus on the transition zones between land and water. Position your camera roughly 12 to 18 inches off the ground, aimed at flat rocks near the edge of a pond or gaps in thick reed beds. These snakes are cold-blooded and frequently seek out 'basking spots'—flat, sun-drenched surfaces where they can warm up in the morning. Setting your camera to face one of these sunny stones between 8 AM and 11 AM provides the highest probability of a clear, stationary shot.

Because these snakes are diurnal and move with quick, fluid motions, a camera with a fast trigger speed (under 0.5 seconds) is essential to avoid capturing just a tail as they glide past. Many standard trail cameras rely on Passive Infrared (PIR) sensors which detect heat; however, because snakes are ectothermic, they may not always trigger the sensor if their body temperature matches the environment. To combat this, use 'Time Lapse' mode if your camera supports it, setting it to take an image every 1–2 minutes during peak daylight hours.

Avoid using artificial lures or baits, as these snakes are active hunters of live prey and won't be attracted to food scraps. Instead, cultivate a snake-friendly environment by maintaining a healthy frog population and providing low-lying cover like logs or dense groundcover. If you are using a camera with adjustable sensitivity, set it to 'High' to increase the chances of the small, slender body of the snake triggering a recording.

Finally, pay attention to the lighting. The brilliant emerald hue of the Green Water Snake is its most striking feature but can be easily washed out by mid-day glare. Position your camera so the sun is behind it or at a 45-degree angle. This will help highlight the satin-like sheen of the scales and the distinct round pupil of the eye, which is a key identifying feature for this harmless species.

Frequently Asked Questions

The Green Water Snake is strictly diurnal, meaning it is active during the day. You are most likely to see them basking in the sun during the morning or hunting for frogs around ponds in the early afternoon.
The best way to attract them is to provide a permanent water source like a garden pond and avoid using pesticides. A healthy population of frogs and plenty of thick, low-lying vegetation will provide both food and safety for them.
Their diet consists almost entirely of small amphibians like frogs and tadpoles. They will also occasionally catch small fish or small lizards if the opportunity arises.
Yes, they are very common in suburban gardens that feature swimming pools, koi ponds, or natural water runoff areas, especially in the eastern parts of South Africa and Zimbabwe.
While both can be green, the Green Water Snake has a smaller, more slender head and large eyes with round pupils. The venomous Boomslang has much larger eyes, a more 'stubby' snout, and keeled scales which give it a rougher appearance compared to the smooth, satiny scales of the Water Snake.

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