Castalius rosimon
In 3 days ~50% in a week ~80%
Castalius rosimon, the common Pierrot, is a small butterfly found in India that belongs to the lycaenids, or blues family. The species is found in Sri Lanka, Bangladesh, India, Myanmar; Tenasserim, extending into the Malayan subregion. In the Indonesian archipelago the butterfly occurs in north-eastern Sumatra, Kalimantan, eastern Java, Bali, Bangka, Timor, Wetar, Kissar, Sumbawa and Sulawesi.
In India the butterfly is found south of the outer ranges of the Himalayas, except in desert tracts; east India; the north-west Himalayas; Assam. The butterfly is also found in the Andaman Islands and the southern Nicobar Islands.
Forewing has the costa, apex and termen edged with black, the edging much broader on apex and termen; base outwards for a short distance more or less densely overlaid. with metallic blue scales which cover and make indistinct a large basal outwardly clavate (club-shaped) black spot; a transverse black oval spot on the discocellulars touching the black edging on the costa... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Taman Negara National Park | 🇲🇾 Malaysia | |
| 2 | Komodo National Park | 🇮🇩 Indonesia | |
| 3 | Mudumalai National Park | 🇮🇳 India | |
| 4 | Chitwan National Park | 🇳🇵 Nepal | |
| 5 | Kanha National Park | 🇮🇳 India | |
| 6 | Cat Tien National Park | 🇻🇳 Vietnam | |
| 7 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 8 | Nagarhole National Park | 🇮🇳 India | |
| 9 | Khao Yai National Park | 🇹🇭 Thailand | |
| 10 | Satpura National Park | 🇮🇳 India | |
| 11 | Doi Inthanon National Park | 🇹🇭 Thailand | |
| 12 | Minneriya National Park | 🇱🇰 Sri Lanka |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Jabalpur | 🇮🇳 India | |
| 2 | Dhaka | 🇧🇩 Bangladesh | |
| 3 | Thrissur | 🇮🇳 India | |
| 4 | Jamshedpur | 🇮🇳 India | |
| 5 | Thiruvananthapuram | 🇮🇳 India | |
| 6 | Vadodara | 🇮🇳 India | |
| 7 | Bhubaneshwar | 🇮🇳 India | |
| 8 | Chhatrapati Sambhajinagar | 🇮🇳 India | |
| 9 | Nagpur | 🇮🇳 India | |
| 10 | Surat | 🇮🇳 India |
Possible
About 20% of wildlife watchers report a Common Pierrot sighting in Khao Yai National Park on a given day, based on 22 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 29th most-seen of the 221 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.
November and December
In those months about 30% of wildlife watchers report a Common Pierrot in Khao Yai National Park on a given day, against under 5% in March and August, the lowest months. Those are among Khao Yai National Park's driest months, with about 35 mm of rain a month against 330 mm in September.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Common Pierrot sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 12
Of the 12 parks where we can rate Common Pierrot sightings, Khao Yai National Park ranks 9th at about 20%. The best odds are in Taman Negara National Park (Malaysia, about 30%), Komodo National Park (Indonesia, about 30%) and Mudumalai National Park (India, about 30%).
Same family: Lycaenidae
The closest relatives of the Common Pierrot that you can see in Khao Yai National Park (family Lycaenidae, Gossamer-winged Butterflies) are Common Posy (about 20%), Fluffy Tit (about 20%) and Common Imperial (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Pierrot is recorded against all the insects logged in Khao Yai National Park (22 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.
