Eurema hecabe
In 3 days ~70% in a week >90%
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 |
Likely
About 40% of wildlife watchers report a Common Grass Yellow sighting in Dhaka on a given day, based on 36 verified sightings from GBIF citizen-science data. It is the 6th most-seen of the 92 insects we can rate there. Over three days the chance rises to about 70%, and over a week to over 90%, if each day is a fresh chance.
November and December
In those months about 50% of wildlife watchers report a Common Grass Yellow in Dhaka on a given day, against under 5% in January and July, the lowest months. Those are among Dhaka's driest months, with about 30 mm of rain a month against 440 mm in July.
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.
Among the best
Of the 52 cities where we can rate Common Grass Yellow sightings, Dhaka ranks 5th at about 40%, level with the leaders once rounded. The best odds are in Jabalpur (India, about 40%), Salem (India, about 40%) and Jamshedpur (India, about 40%).
Same family: Pieridae
The closest relatives of the Common Grass Yellow that you can see in Dhaka (family Pieridae, Whites, Yellows, and Sulphurs) are Psyche (about 30%), Western Striped Albatross (about 30%) and Lemon Migrant (about 20%), 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 Dhaka (36 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.
