Boiga cyanea
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~40% in a week ~70%
Boiga cyanea, commonly known as the green cat snake, is a colubrid snake species found in South Asia, China and South-east Asia. Medium to large in length, slightly compressed, medium bodied snake with a moderately long tail. Head distinct from narrow neck with a rounded snout. Eyes large in size with vertically elliptical pupils. Dorsal scales smooth with single or double apical pits. Ventrals with a feeble lateral keels. Dorsal scale count usually 21 - 21 ( 23 ) - 15. Its long prehensile tail makes it purely arboreal.
Dorsal color uniform green or green mixed with grayish or bluish. Belly color greenish or yellowish white. Top of the head usually similar to dorsal color or sometimes of brownish tint. Upper lip color yellowish; most of head scaled margined with black. Eyes golden brown. Hatchlings are reddish brown with a green head. The color of the hatchlings starts to change after 8–9 months of age.
Length: Maximum: 190 cm. Common: 115 cm. (SVL. 87 cm.) The green cat snake found in Bangladesh, Bhutan, Cambodia, China (Yunnan- part), India (Sikkim, Darjeeling & Jalpaiguri, West Bengal, Assam, Arunachal Pradesh, Andaman & Nicobar Islands), Laos... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 2 | Khao Sok National Park | 🇹🇭 Thailand | |
| 3 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 4 | Khao Yai National Park | 🇹🇭 Thailand |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Moscow Zoo | 🇷🇺 Russia | |
| 2 | Dvůr Králové Zoo | 🇨🇿 Czechia | |
| 3 | Columbus Zoo and Aquarium | 🇺🇸 United States | |
| 4 | Siam Serpentarium | 🇹🇭 Thailand | |
| 5 | Snake Farm of Queen Saovabha Memorial Institute | 🇹🇭 Thailand |
Possible
About 20% of wildlife watchers report a Green Cat Snake sighting in Khao Sok National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 29th most-seen of the 44 reptiles we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
February
In that month about 30% of wildlife watchers report a Green Cat Snake in Khao Sok National Park on a given day, against under 5% in May–June, August–September and December, the lowest months. That is one of Khao Sok National Park's driest months, with about 35 mm of rain against 280 mm in October.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Green Cat Snake sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 4 parks where we can rate Green Cat Snake sightings, Khao Sok National Park ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Cat Tien National Park (Vietnam, about 20%).
Same genus: Boiga
The closest relatives of the Green Cat Snake that you can see in Khao Sok National Park (genus Boiga, Australasian Cat Snakes) are Western Mangrove Cat Snake (about 50%), White-spotted Cat Snake (about 10%) and Jasper Cat Snake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Green Cat Snake is recorded against all the reptiles logged in Khao Sok National Park (9 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.
