Eurema blanda
In 3 days ~50% in a week ~80%
Eurema blanda, the three-spot grass yellow, is a small butterfly of the family Pieridae which is found in Sri Lanka, India and southeast Asia. Wet form: Male. Upper-side lemon-yellow. Fore-wing with the outer marginal black band anteriorly broader than in Sri Lankan specimens of Eurema hecabe, the posterior end shorter and its inner edge outwardly oblique. Hind-wing with a moderately broad black outer band. Underside. Both wings with more or less defined ordinary markings of wet form. Fore-wing with three marks in the cell, in addition to the discocellular. No sub-apical patch. Female. Not seen.
Intermediate form: Male. Not seen. Female. Upper-side. Fore-wing with similar outer band to the wet form. Hind-wing with a broad black outer marginal band. Underside with slightly-defined ordinary brown markings as in wet form. Fore-wing with a brown sub-apical patch.
Dry form: Smaller than in wet form. Male. Upper-side. Fore-wing with narrower outer marginal band, its posterior end much smaller. Hind-wing with a slender outer band. Underside. Both wings with similar ordinary markings to the wet form. Fore-wing with a more or less defined sub-apical patch. Female. Upper-side... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 2 | Namdapha National Park | 🇮🇳 India | |
| 3 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 4 | Periyar National Park | 🇮🇳 India | |
| 5 | Kinabalu Park | 🇲🇾 Malaysia | |
| 6 | Khao Yai National Park | 🇹🇭 Thailand | |
| 7 | Taroko National Park | 🇹🇼 Taiwan |
Possible
About 20% of wildlife watchers report a Three-Spotted Grass Yellow sighting in Periyar National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 25th most-seen of the 44 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
August
In that month about 50% of wildlife watchers report a Three-Spotted Grass Yellow in Periyar National Park on a given day, against under 5% in June, September and December–April, the lowest months. That is one of Periyar National Park's wettest months, with about 410 mm of rain against 15 mm in February.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Three-Spotted Grass Yellow sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 7
Of the 7 parks where we can rate Three-Spotted Grass Yellow sightings, Periyar National Park ranks 4th at about 20%. The best odds are in Cuc Phuong National Park (Vietnam, about 30%), Namdapha National Park (India, about 30%) and Sinharaja Forest Reserve (Sri Lanka, about 30%).
GBIF citizen-science records
It is estimated from how often the Three-Spotted Grass Yellow is recorded against all the insects logged in Periyar National Park (7 verified sightings from 2019 to 2026), 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.
