Eurema hecabe
In 3 days ~40% in a week ~70%
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 |
With luck
About 10% of wildlife watchers report a Common Grass Yellow sighting in Ho Chi Minh City on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 52nd most-seen of the 121 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
April–May, September–October and December–January
In those months about 20% of wildlife watchers report a Common Grass Yellow in Ho Chi Minh City on a given day, against under 5% in February, June–July and November, the lowest months.
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.
35th of 52
Of the 52 cities where we can rate Common Grass Yellow sightings, Ho Chi Minh City ranks 35th at about 10%. 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 Ho Chi Minh City (family Pieridae, Whites, Yellows, and Sulphurs) are Lemon Migrant (about 30%), Western Striped Albatross (about 30%) and Psyche (about 30%), 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 Ho Chi Minh City (13 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.
