Calamaria gervaisii
In 3 days ~40% in a week ~70%
Calamaria gervaisii, commonly known as Gervais's worm snake and the Philippine dwarf snake, is a species of small fossorial snake in the subfamily Calamariinae of the family Colubridae. The species is native to the Philippines.
The specific name, gervaisii, is in honor of French zoologist Paul Gervais. Calamaria gervaisii is endemic to the Philippine Islands. Its geographic distribution includes the islands of Basilan, Catanduanes, Cebu, Lubang, Luzon, Mindanao, Mindoro, Negros, Panay, Polillo, and Tablas.
Calamaria gervaisii is found from near sea level up to altitudes of 1,000 m (3,281 ft). It lives in forests and plantations, burrowing in the leaf litter and hiding under stones and fallen logs, or between the buttresses of trees.
The longest specimen of Calamaria gervaisii measured by Boulenger (1894) had a total length of 25.5 cm (10.0 in), which included a tail 2.0 cm (0.79 in) long. Calamaria gervaisii is oviparous. The IUCN has listed Calamaria gervaisii as being of "least concern" because it has a wide range, appears to be abundant with a stable... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manila | 🇵🇭 Philippines |
Possible
About 20% of wildlife watchers report a Gervais' Worm Snake sighting in Manila on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 6th most-seen of the 12 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.
November and December
In those months about 30% of wildlife watchers report a Gervais' Worm Snake in Manila on a given day, against under 5% in January, April and June, the lowest months. Those are among Manila's wettest months, with about 370 mm of rain a month against 100 mm in April.
Only Manila, in our data
Manila is the only city on Wallace's Line with enough records to rate Gervais' Worm Snake sightings: about 20% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Gervais' Worm Snake is recorded against all the reptiles logged in Manila (21 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.
