Hypnale hypnale
Silhouette: Steven Traver · PhyloPic
In 3 days ~30% in a week ~60%
Hypnale hypnale is a venomous pit viper species endemic to India and Sri Lanka. Common names include the hump-nosed viper, Merrem's hump-nosed viper hump-nosed pit viper, and Oriental hump-nosed viper. No subspecies are currently recognized.
H. hypnale grows to an average of 30 to 45 cm (12 to 18 in) in total length (including tail). The Armed Forces Pest Management Board states 0.4 to 0.6 m (1 ft 4 in to 2 ft 0 in) in total length. Its build is that of a typical viperid with a stout body and a wide head. The snout is pointed and turned upwards, ending in a hump. The frontal, supraoculars, and parietal shields are large, but those on the snout are small and irregular.
The color pattern is grayish with heavy brown mottling, overlaid with a double row of large dark spots. The belly is brownish or yellowish with dark mottling. The tip of the tail is yellow or reddish. Hypnale hypnale is found in peninsular India to the Western Ghats as far north as 16° N, and in Sri Lanka, according to M.A. Smith (1943). The type locality given is "Castle Rock, Karnataka, India." Hypnale hypnale is found in dense jungle and coffee plantations in... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneriya National Park | 🇱🇰 Sri Lanka |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Colombo [Sri Jayawardenepura Kotte] | 🇱🇰 Sri Lanka |
With luck
About 10% of wildlife watchers report a Hump-nosed Viper sighting in Colombo [Sri Jayawardenepura Kotte] on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 19th most-seen of the 23 reptiles we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
July and August
In those months about 20% of wildlife watchers report a Hump-nosed Viper in Colombo [Sri Jayawardenepura Kotte] on a given day, against under 5% in March, May–June and October–November, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Hump-nosed Viper sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Only Colombo [Sri Jayawardenepura Kotte], in our data
Colombo [Sri Jayawardenepura Kotte] is the only city on Wallace's Line with enough records to rate Hump-nosed Viper sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Hump-nosed Viper is recorded against all the reptiles logged in Colombo [Sri Jayawardenepura Kotte] (9 verified sightings), 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.
