Eurema hecabe
In 3 days ~50% in a week ~80%
Eurema hecabe, the common grass yellow, is a small pierid butterfly species found in Asia, Africa and Australia. They are found flying close to the ground and are found in open grass and scrub habitats. It is simply known as "the grass yellow" in parts of its range; the general term otherwise refers to the entire genus Eurema.
The common grass yellow exhibits seasonal polyphenism. The lepidopteran has a darker summer morph, triggered by a long day exceeding 13 hours in duration, while the shorter diurnal period of 12 hours or less induces a fairer morph in the post-monsoon period.
Upperside (dorsal surface): yellow, variable in tint from sulphur to rich lemon yellow according to season and locality. Forewing: apex and termen deep black, this colour continued narrowly along the costal margin to base of wing, near which it often becomes diffuse; the inner margin of the black area from costa to vein 4 very oblique and irregular, between veins 2 and 4 excavate on the inner side, this excavation outwardly rounded between the veins and inwardly toothed on vein 3; below vein 2 the black area is suddenly dilated into a square spot which occupies the whole of the... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Namdapha National Park | 🇮🇳 India | |
| 2 | Litchfield National Park | 🇦🇺 Australia | |
| 3 | Nitmiluk National Park | 🇦🇺 Australia | |
| 4 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 5 | Kakadu National Park | 🇦🇺 Australia | |
| 6 | Ranthambore National Park | 🇮🇳 India | |
| 7 | Kanha National Park | 🇮🇳 India | |
| 8 | Keoladeo National Park | 🇮🇳 India | |
| 9 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 10 | Satpura National Park | 🇮🇳 India | |
| 11 | Daintree National Park | 🇦🇺 Australia | |
| 12 | Lamington National Park | 🇦🇺 Australia | |
| 13 | Noosa National Park | 🇦🇺 Australia | |
| 14 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 15 | Minneriya National Park | 🇱🇰 Sri Lanka | |
| 16 | Springbrook National Park | 🇦🇺 Australia | |
| 17 | Hluhluwe-Imfolozi Park | 🇿🇦 South Africa | |
| 18 | iSimangaliso Wetland Park | 🇿🇦 South Africa | |
| 19 | Kruger National Park | 🇿🇦 South Africa |
Possible
About 20% of wildlife watchers report a Common Grass Yellow sighting in Keoladeo National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 17th most-seen of the 23 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.
September
In that month about 60% of wildlife watchers report a Common Grass Yellow in Keoladeo National Park on a given day, against under 5% in March, October and December–January, the lowest months. That is one of Keoladeo National Park's wettest months, with about 110 mm of rain against 5 mm in November. June has too few records to rate.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Common Grass Yellow sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
8th of 19
Of the 19 parks where we can rate Common Grass Yellow sightings, Keoladeo National Park ranks 8th at about 20%. The best odds are in Namdapha National Park (India, about 30%), Litchfield National Park (Australia, about 30%) and Nitmiluk National Park (Australia, about 30%).
Same family: Pieridae
The closest relatives of the Common Grass Yellow that you can see in Keoladeo National Park (family Pieridae, Whites, Yellows, and Sulphurs) are Common Gull (butterfly) (about 40%), Yellow Orange Tip (about 40%) and White Orange Tip (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Grass Yellow is recorded against all the insects logged in Keoladeo National Park (9 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.
