Boiga cyanea
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~30% in a week ~50%
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 |
With luck
About 10% of wildlife watchers report a Green Cat Snake sighting in Khao Yai National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 39th most-seen of the 46 reptiles we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
August and September
In those months about 30% of wildlife watchers report a Green Cat Snake in Khao Yai National Park on a given day, against under 5% in July and October–May, the lowest months. Those are among Khao Yai National Park's wettest months, with about 290 mm of rain a month against 15 mm in December.
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.
4th of 4
Of the 4 parks where we can rate Green Cat Snake sightings, Khao Yai National Park ranks 4th at about 10%. The best odds are in Cat Tien National Park (Vietnam, about 20%), Khao Sok National Park (Thailand, about 20%) and Doi Inthanon National Park (Thailand, about 10%).
Same family: Colubridae
The closest relatives of the Green Cat Snake that you can see in Khao Yai National Park (family Colubridae, Colubrid Snakes) are Oriental Whipsnake (about 30%), Yellow-Spotted Keelback (about 20%) and Chinese Ratsnake (about 20%), 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 Yai 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.
