Gandaca harina
In 3 days ~30% in a week ~50%
Gandaca harina, the tree yellow, is a butterfly in the family Pieridae. It is found in India, Thailand, Cambodia, Myanmar, Malaysia, Singapore, Philippines, and Indonesia. The species was first described by Thomas Horsfield in 1829.
Gandaca harina is a small butterfly with a wingspan ranging from 35 to 45 mm. The upperside of the forewings and hindwings in males is lemon-yellow, while females are paler or greenish-white with a narrow, dark brown border on the forewing apex. The underside of both sexes is uniformly plain pale yellow without any dark markings or spots, serving as a primary distinguishing characteristic separating it from similar Eurema species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Singapore | 🇸🇬 Singapore | |
| 2 | Kuala Lumpur | 🇲🇾 Malaysia |
With luck
About 10% of wildlife watchers report a Tree Yellow sighting in Kaeng Krachan National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 117th most-seen of the 296 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
January–May, July and October–November
In those months about 10% of wildlife watchers report a Tree Yellow in Kaeng Krachan National Park on a given day, against under 5% in June, August–September and December, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Tree 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 2 parks where we can rate Tree Yellow sightings, Kaeng Krachan National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Cat Tien National Park (Vietnam, about 10%).
Same family: Pieridae
The closest relatives of the Tree Yellow that you can see in Kaeng Krachan National Park (family Pieridae, Whites, Yellows, and Sulphurs) are Yellow Orange Tip (about 30%), Orange Gull (about 20%) and Redspot Sawtooth (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Tree Yellow is recorded against all the insects logged in Kaeng Krachan National Park (12 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.
