Fowlea piscator
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~70% in a week ~90%
The checkered keelback (Fowlea piscator), also known commonly as the Asiatic water snake, is a common species in the subfamily Natricinae of the family Colubridae. The species is endemic to Asia. It is non-venomous. The eye of F. piscator is rather small and shorter than its distance from the nostril in the adult. Its rostral scale is visible from above. The internasal scales are much narrowed anteriorly and subtriangular, with the anterior angle truncated and as long as the prefrontal scales. The frontal scale is longer than its distance from the end of the snout, and as long as the parietals or a little shorter. The loreal is nearly as long as it is deep. There are one preocular and three (rarely four) post-oculars. Its temporals are 2+2 or 2+3. There are normally nine upper labials, with the fourth and fifth entering the eye; and five lower labials in contact with the anterior chin-shields, which are shorter than the posterior. The dorsal scales are arranged in 19 rows, strongly keeled, with outer rows smooth. The ventrals number 125–158, the anal is divided, and the subcaudals number 64–90. Coloration is very variable, consisting of dark spots arranged quincuncially... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Keoladeo National Park | 🇮🇳 India | |
| 2 | Ranthambore National Park | 🇮🇳 India | |
| 3 | Chitwan National Park | 🇳🇵 Nepal | |
| 4 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 5 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 6 | Khao Yai National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chattogram | 🇧🇩 Bangladesh | |
| 2 | Dhaka | 🇧🇩 Bangladesh | |
| 3 | Thrissur | 🇮🇳 India | |
| 4 | Thiruvananthapuram | 🇮🇳 India | |
| 5 | Lucknow | 🇮🇳 India | |
| 6 | Jabalpur | 🇮🇳 India | |
| 7 | Bengaluru | 🇮🇳 India | |
| 8 | Guwahati | 🇮🇳 India | |
| 9 | Kolkata | 🇮🇳 India | |
| 10 | Yangon | 🇲🇲 Myanmar |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Nehru Zoological Park | 🇮🇳 India | |
| 2 | Chhatbir Zoo | 🇮🇳 India |
Possible
About 30% of wildlife watchers report a Chequered Keelback sighting in Thiruvananthapuram on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 4th most-seen of the 5 reptiles we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
March and July
In those months about 50% of wildlife watchers report a Chequered Keelback in Thiruvananthapuram on a given day, against under 5% in January and October, the lowest months.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Chequered Keelback sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
4th of 20
Of the 20 cities where we can rate Chequered Keelback sightings, Thiruvananthapuram ranks 4th at about 30%. The best odds are in Chattogram (Bangladesh, about 50%), Dhaka (Bangladesh, about 40%) and Thrissur (India, about 40%).
GBIF citizen-science records
It is estimated from how often the Chequered Keelback is recorded against all the reptiles logged in Thiruvananthapuram (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.
