Halpe porus
In 3 days ~30% in a week ~60%
Halpe porus, commonly known as Moore's ace, is a species of butterfly in the family Hesperiidae, found in India. Male. Upperside blackish-brown. Forewing with seven semi-hyaline spots; two within the cell towards its end, one above the other, one a little larger close to the base of the first median interspace, and a similar spot obliquely above it, near the base of the second median interspace, three small sub-apical spots in an outwardly oblique curve. Hindwing with a small, slightly suffused space, slightly yellow-tinted in the upper middle of the wing, otherwise without markings. Cilia of forewing chequered brown and greyish-white, of hindwing greyish-white, with a few brown marks on it. Underside with the ground colour slightly paler, the spots as on the upperside and a series of small white sub-marginal spots in the interspaces, the series generally complete, but in some examples one or two of them are obsolescent. Hindwing with a conspicuous discal white outwardly curved band, divided by the veins into six elongated spots, commencing from near the costa before the apex, increasing in size hindwards, largest in the middle, and extending to near the submedian... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tuen Mun | 🇨🇳 China |
With luck
About 10% of wildlife watchers report a Moore's Ace sighting in Cat Tien National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 87th most-seen of the 125 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
February and April–June
In those months about 20% of wildlife watchers report a Moore's Ace in Cat Tien National Park on a given day, against under 5% in March and July–January, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Moore's Ace sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Moore's Ace sightings, Cat Tien National Park has the highest daily chance: about 10%. Next come Kaeng Krachan National Park (Thailand, about 10%).
Same order: Lepidoptera
The closest relatives of the Moore's Ace that you can see in Cat Tien National Park (order Lepidoptera, Butterflies and Moths) are Green Dragontail Butterfly (about 40%), Yellow Pansy (about 40%) and Yellow Orange Tip (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Moore's Ace is recorded against all the insects logged in Cat Tien National Park (8 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.
