Crocodylus siamensis
Silhouette: Steven Traver · PhyloPic
In 3 days ~90% in a week >90%
The Siamese crocodile (Crocodylus siamensis) is a medium-sized freshwater crocodile native to Thailand, Laos, Cambodia, Vietnam and Kalimantan in Indonesia. It is critically endangered. The Siamese crocodile was scientifically described by Johann Gottlob Schneider in 1801 under the name Crocodilus siamensis based on a zoological specimen from Thailand.
Below is a cladogram based on a 2018 tip dating study using morphological, molecular DNA sequencing, and stratigraphic fossil age data. This was revised in a paleogenomics study using DNA extracted from the extinct Voay. Hall's New Guinea crocodile placement was suggested in 2023.
The Siamese crocodile is a medium-sized, freshwater crocodilian, with a relatively broad, smooth snout and an elevated, bony crest behind each eye. Overall, it is olive-green, with some variation to dark-green. Young individuals measure 1.2–1.5 m (3.9–4.9 ft) and weigh 6–12 kg (13–26 lb), growing to a length of 2.1–3 m (6.9–9.8 ft) and a weight of 40–120 kg (88–265 lb) as an adult. Three individuals measuring 2.12–2.63 m (7.0–8.6 ft) and weighing 40–87 kg (88–192 lb) had bite force of 2,073–4,577 N (466... 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.
Likely
About 60% of wildlife watchers report a Siamese Crocodile sighting in Cat Tien National Park on a given day, based on 178 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 3rd most-seen of the 45 reptiles we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
January
In that month about 80% of wildlife watchers report a Siamese Crocodile in Cat Tien National Park on a given day, against about 10% in September, the lowest month. That is one of Cat Tien National Park's driest months, with about 30 mm of rain against 490 mm in July.
Between 5 and 8 am
Across all the parks we cover, that three-hour window holds the most Siamese Crocodile sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
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 Siamese Crocodile sightings: about 60% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Siamese Crocodile is recorded against all the reptiles logged in Cat Tien National Park (178 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.
