Reptiles Active day and night

Rhombic Night Adder

Causus rhombeatus

iNaturalist Wikipedia

A distinctive toad-hunting specialist recognizable by the bold 'V' on its head, the Rhombic Night Adder is a common but often misunderstood resident of African gardens and grasslands.

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Quick Identification

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Size

60-90 cm (24-35 inches) in length; rarely exceeds 100 cm (39 inches).

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Colors

Pale grey, light brown, or olive-green background with 20-30 dark, rhombic (diamond-shaped) blotches along the back. Cream to yellowish underside.

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Key Features

Distinctive dark 'V' mark on the head with the point between the eyes
Large, dark diamond-shaped blotches with pale borders along the spine
Stocky body with a rounded snout and large eyes with round pupils
Scales are satiny and slightly keeled

When You’ll See Them

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Activity pattern Active day and night

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Peak hours 7-11 AM, 4-8 PM

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Season October-March (during the rainy season when toads are active)

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Diet A specialized feeder that primarily eats toads and frogs. They use their keen sense of smell to track down amphibians near water sources.

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Habitat Moist savannas, grasslands, and suburban gardens, particularly those near ponds or marshes.

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Where Does the Rhombic Night Adder Live?

The Rhombic Night Adder is widely distributed across Sub-Saharan Africa, representing one of the continent's most common venomous snakes. Its range extends from the southern tip of South Africa, northward through East Africa into Ethiopia, and westward across the moist savanna belt to Nigeria and parts of West Africa. It is particularly prevalent in regions with high rainfall and plenty of amphibian activity.

Basemap © OpenStreetMap contributors

10 Countries

12.5M km² Range

Least Concern Conservation

ZA South Africa ZW Zimbabwe MZ Mozambique TZ Tanzania KE Kenya ET Ethiopia ZM Zambia UG Uganda NG Nigeria GH Ghana

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

Despite its name, the Rhombic Night Adder is frequently active during the day, particularly in the early morning or late afternoon when it hunts for its favorite prey. They are remarkably fast for an adder and are known to actively pursue their food rather than relying solely on ambush tactics. When threatened, they exhibit a dramatic defensive display: they will hiss loudly, inflate their bodies to appear larger, and may strike repeatedly if further provoked.

In suburban environments, they are surprisingly common because they are attracted to the high populations of toads found in garden ponds. While they are venomous, their venom is primarily cytotoxic and, while painful and causing swelling, it is generally not considered life-threatening to healthy adult humans. They are solitary creatures that spend much of their time hidden in leaf litter, under logs, or in abandoned termite mounds.

photo_camera EverydayEarth exclusive

Camera Tips

To capture a Rhombic Night Adder on your backyard camera, focus your efforts on the 'amphibian highways.' These snakes are toad specialists, so placing your camera near garden ponds, leaky outdoor taps, or drainage areas is your best bet. Position the camera very low—ideally no more than 10-15 centimeters off the ground—to get a clear profile shot of their distinctive head markings and 'V' shape.

Standard PIR (Passive Infrared) sensors can struggle with cold-blooded reptiles since they rely on heat signatures. To overcome this, use a high-sensitivity setting if your camera allows it, or better yet, use a 'Time Lapse' mode set to take a photo every 30-60 seconds during the early morning and late afternoon. This increases your chances of catching a snake as it slowly cruises through the grass in search of prey.

Lighting is crucial for identification. Night adders have a beautiful satiny sheen that can wash out under heavy flash. If your camera has adjustable IR flash, set it to 'Medium' or 'Low' to avoid overexposing the snake's markings. Since they are active during the day as well, ensure your camera is placed in a spot with dappled shade rather than direct, harsh sunlight, which can create high-contrast shadows that hide the rhombic pattern.

Similar Species

Species that look similar or are commonly confused with Rhombic Night Adder.

Puff Adder

Much thicker body, wider triangular head, and horizontal chevron markings instead of diamond shapes.

Snouted Night Adder

Features a distinctly upturned snout used for burrowing, and is generally smaller than the Rhombic Night Adder.

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Frequently Asked Questions

While their name suggests they are nocturnal, Rhombic Night Adders are actually 'cathemeral,' meaning they are active during both day and night. They are most frequently spotted during daylight hours, especially in the early morning and late afternoon when they are hunting toads.

The most effective way to attract this species is to create a habitat for their prey. A garden pond or a damp area with plenty of leaf litter will attract toads and frogs, which in turn will bring Rhombic Night Adders. They prefer gardens that provide plenty of low-level cover like logs, rocks, and thick ground-cover plants.

They are amphibian specialists. Their diet consists almost exclusively of toads and frogs. Unlike many other adders that wait for prey to come to them, the Rhombic Night Adder will actively track its prey using its tongue to pick up chemical scents.

Yes, they are very common in suburban areas across Sub-Saharan Africa. Because they thrive on the common garden toad, they often take up residence in well-watered gardens, parks, and golf courses.

The easiest way to distinguish them is the head marking: the Rhombic Night Adder has a distinct dark 'V' shape on its head pointing forward, whereas the Puff Adder has horizontal chevrons on its body and a much wider, triangular head. Additionally, the Night Adder has large eyes with round pupils, while the Puff Adder has vertical, slit-like pupils.

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