Udaspes folus
In 3 days ~30% in a week ~60%
Ancistroides folus, the grass demon, is a small but prominent butterfly found in India & Nepal that belongs to the skipper family, Hesperiidae. It is regarded as an occasional pest of ginger and turmeric plants. Male. Upperside black, the basal half of both wings covered with minute yellowish scales, markings pure white, semi-hyaline. Forewing with a large white spot filling up the end of the cell, two similar conjoined spots outwardly below it extending from beneath vein 4 to the sub-median vein, hardly separated from each other by vein 2; four conjugated sub-apical spots, the uppermost one minute, two similar spots below them nearer the outer margin, a small spot between these and the two large conjoined spots. Hindwing with a very large medial white patch with its margin sinuous all round; abdominal area covered with yellowish hairs. Underside paler. Forewing with the markings as on the upperside. Hindwing with the white medial patch extending to the abdominal margin from near the costa to one-third above the anal angle, the extension suffused with grey, also extending narrowly to the outer margin, double blackish-brown lunular marks, within the white space at... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kanha National Park | 🇮🇳 India |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kozhikode | 🇮🇳 India | |
| 2 | Tuen Mun | 🇨🇳 China | |
| 3 | Jabalpur | 🇮🇳 India | |
| 4 | Thrissur | 🇮🇳 India | |
| 5 | Coimbatore | 🇮🇳 India | |
| 6 | Thiruvananthapuram | 🇮🇳 India | |
| 7 | Mumbai | 🇮🇳 India | |
| 8 | Kochi | 🇮🇳 India | |
| 9 | Bengaluru | 🇮🇳 India | |
| 10 | Ponnani | 🇮🇳 India |
With luck
About 10% of wildlife watchers report a Grass Demon sighting in Jakarta on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 75th most-seen of the 239 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
January–February, April and October
In those months about 20% of wildlife watchers report a Grass Demon in Jakarta on a given day, against under 5% in August–September and November–December, the lowest months. Those are among Jakarta's wettest months, with about 270 mm of rain a month against 55 mm in August.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Grass Demon sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
16th of 26
Of the 26 cities where we can rate Grass Demon sightings, Jakarta ranks 16th at about 10%. The best odds are in Kozhikode (India, about 20%), Tuen Mun (China, about 20%) and Jabalpur (India, about 20%).
Same family: Hesperiidae
The closest relatives of the Grass Demon that you can see in Jakarta (family Hesperiidae, Skippers) are Indian Palm Bob (about 20%), Common Redeye (about 10%) and Yellow Grass Dart (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Grass Demon is recorded against all the insects logged in Jakarta (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.
