Ptyas dhumnades
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Big-Eyed Ratsnake sighting in Taipei on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 31st most-seen of the 35 reptiles we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
May and July
In those months about 10% of wildlife watchers report a Big-Eyed Ratsnake in Taipei on a given day, against under 5% in June and August–April, 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.
3rd of 3
Of the 3 cities where we can rate Big-Eyed Ratsnake sightings, Taipei ranks 3rd at under 5%. The best odds are in Nanjing (China, about 10%) and Hangzhou (China, about 10%).
Same genus: Ptyas
The closest relatives of the Big-Eyed Ratsnake that you can see in Taipei (genus Ptyas, Asian Rat Snakes) are Chinese Green Snake (about 10%) and Dhaman (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 Taipei (8 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.
