Ptyas dhumnades
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~20% in a week ~50%
Ptyas dhumnades, commonly known as big-eyed rat snake, is a species of snake in the family Colubridae. It is found in China, Vietnam, and Taiwan. The species is widespread in South China (Anhui, Chongqin, Gansu, Fujian, Guangdong, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shanxi, Shaanxi, Shanghai,
Sichuan, Tianjin,Yunnan, Zhejiang), Vietnam, and Taiwan. It is found at elevations between 50 m and 2,000 m. It is often confused with other members of the genus Ptyas, particularly Ptyas nigromarginata due to overlapping features but has distinct characteristics that set it apart. It is not entirely clear if these two species are sympatric.
Dorsal scale rows: 16; Ventrals: 187–194; Subcaudals: 108-116; Loreals: 1; supralabials: 8; Subralabials entering eye 4-5; Number of dorsal scale rows at midbody keeled: 2 or 4; 9: Two distinct medial series of dorsal scales throughout: present; 10: Distinct longitudinal stripes on lateral side at two-heads length before vent position: present; 11: Anterior part of body green: - false. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Moscow Zoo | 🇷🇺 Russia |
With luck
About 10% of wildlife watchers report a Big-Eyed Ratsnake sighting in Hangzhou on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 10th most-seen of the 14 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
September and October
In those months about 20% of wildlife watchers report a Big-Eyed Ratsnake in Hangzhou on a given day, against under 5% in November to May, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Big-Eyed Ratsnake sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 3 cities where we can rate Big-Eyed Ratsnake sightings, Hangzhou ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Nanjing (China, about 10%).
Same family: Colubridae
The closest relatives of the Big-Eyed Ratsnake that you can see in Hangzhou (family Colubridae, Colubrid Snakes) are Red-banded Snake (about 10%), Beauty Rat Snake (about 10%) and Northern Reed Snake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Big-Eyed Ratsnake is recorded against all the reptiles logged in Hangzhou (7 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.
