Taractrocera maevius
In 3 days ~10% in a week ~20%
Taractrocera maevius, the common grass dart, is a species of butterfly belonging to the family Hesperiidae. It is found in India, Sri Lanka and Myanmar. Male. Upperside olive-brown, with yellowish-white markings. Forewing with a short streak on the median vein in the middle of the cell, another above it at the upper end, with two short small streaks between it and the costa, sometimes connected together; a series of spots in two parts across the disc, three conjoined from the costa near the apex, and four commencing at the base of the second median interspace, divided from each other by the veins, all the spots somewhat quadrate and excavated on their outward sides, two small quadrate spots nearer the margin in the fifth and sixth interspaces. Hindwing with a series of small spots in almost a straight line in the middle of the disc. Cilia of both wings grey with white tips. Underside with the colour similar, almost as dark as on the upperside, markings similar, but on the hindwing there is a bar across the end of the cell, and two small sub-apical spots outside it. Antennse black with white bands, the club with a white basal patch on the underside; palpi above grey... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Common Grass-Dart sighting in Bangkok on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 147th most-seen of the 245 insects 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.
July
In that month about 10% of wildlife watchers report a Common Grass-Dart in Bangkok on a given day, against under 5% in August to June, the lowest months. That is one of Bangkok's wettest months, with about 170 mm of rain against 10 mm in December.
7th of 7
Of the 7 cities where we can rate Common Grass-Dart sightings, Bangkok ranks 7th at under 5%. The best odds are in Salem (India, about 20%), Colombo [Sri Jayawardenepura Kotte] (Sri Lanka, about 20%) and Kochi (India, about 10%).
Same family: Hesperiidae
The closest relatives of the Common Grass-Dart that you can see in Bangkok (family Hesperiidae, Skippers) are Indian Palm Bob (about 10%) and Grass Demon (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Grass-Dart is recorded against all the insects logged in Bangkok (12 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.
