Causus rhombeatus
Silhouette: Steven Traver · PhyloPic
In 3 days ~60% in a week ~80%
Causus rhombeatus, commonly known as the rhombic night adder, is a species of venomous snake in the subfamily Viperinae of the family Viperidae. The species is native to Sub-Saharan Africa. No subspecies are recognized as being valid.
With an average total length (tail included) of 60 cm (24 in), C. rhombeatus is the largest member of the genus Causus. The longest individual ever recorded was a male, 93 cm (37 in) in total length, collected in eastern Zimbabwe.
The head has a snout that is relatively blunt (i.e., more rounded than in other members of this genus), on the sides of which the nostrils are positioned. The circumorbital ring consists of 2–3 preoculars, 1–2 postoculars, and 1–2 suboculars that separate the eye from the supralabials. The temporal scales usually number 2+3, sometimes 2+4, but very rarely 2+2 or 3+3. There are 6 supralabial scales, very rarely 7. The sublabial scales usually number 7 or 10, rarely 8, and very rarely 11, 12 or 13. The first 3–4 sublabials are in contact with the anterior chin shields. The posterior chin shields are small and often indistinguishable from the gulars.
At midbody there are 15–21 rows of dorsal scales that are moderately... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Garden Route National Park | 🇿🇦 South Africa | |
| 2 | Addo Elephant National Park | 🇿🇦 South Africa |
Possible
About 20% of wildlife watchers report a Rhombic Night Adder sighting in Garden Route National Park on a given day, based on 110 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 6th most-seen of the 35 reptiles we can rate there. Over three days the chance rises to about 60%, and over a week to about 80%, if each day is a fresh chance.
January to April
In those months about 30% of wildlife watchers report a Rhombic Night Adder in Garden Route National Park on a given day, against about 10% in June to August, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Rhombic Night Adder sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Rhombic Night Adder sightings, Garden Route National Park has the highest daily chance: about 20%. Next come Addo Elephant National Park (South Africa, about 10%).
Same family: Viperidae
The closest relatives of the Rhombic Night Adder that you can see in Garden Route National Park (family Viperidae, Vipers) are Puff Adder (about 20%) and Berg Adder (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rhombic Night Adder is recorded against all the reptiles logged in Garden Route National Park (110 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
