Subsessor bocourti
Silhouette: SeismicShrimp · PhyloPic
In 3 days ~30% in a week ~60%
Subsessor is a genus of snake in the family Homalopsidae. The genus is monotypic, containing the sole species Subsessor bocourti. The species is commonly known as Bocourt's mud snake or Bocourt's water snake and has traditionally been placed in the genus Enhydris.
Both the specific name, bocourti, and the common name, Bocourt's water snake, refer to French zoologist Marie Firmin Bocourt. S. bocourti is found in a wide range of stagnant fresh water habitats in Mainland Southeast Asia. Records from China are questionable.
A robust snake, S. bocourti can surpass 1 m (3.3 ft) in length. S. bocourti is a live bearing species, giving birth to, on average, 3–8 fully formed neonate snakes. S. bocourti feeds on frogs, fishes, and crustaceans. Bocourt's water snake is widely caught for its skin and sometimes also eaten.
Boulenger GA (1896). Catalogue of the Snakes in the British Museum (Natural History). Volume III. Containing the Colubridæ (Opisthoglyphæ and Proteroglyphæ)... London: Trustees of the British Museum (Natural History).... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cat Tien National Park | 🇻🇳 Vietnam |
More parks will be added in future updates.
No species of the same family or order lives in Cat Tien National Park, so these are its closest relatives here: other reptiles.
With luck
About 10% of wildlife watchers report a Bocourt's Water Snake sighting in Cat Tien National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 44th most-seen of the 45 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.
August and September
In those months about 30% of wildlife watchers report a Bocourt's Water Snake in Cat Tien National Park on a given day, against under 5% in July and October–May, the lowest months. Those are among Cat Tien National Park's wettest months, with about 450 mm of rain a month against 15 mm in February.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Bocourt's Water Snake sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is seen both by day and at night.
Only Cat Tien National Park, in our data
Cat Tien National Park is the only park on Wallace's Line with enough records to rate Bocourt's Water Snake sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Bocourt's Water Snake is recorded against all the reptiles logged in Cat Tien National Park (5 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.
