Arhopala centaurus
In 3 days ~40% in a week ~70%
Arhopala centaurus, the centaur oakblue or dull oakblue, is a species of lycaenid or blue butterfly found in India and southeast Asia to the Philippines. Male. Upperside very dark blue with a violaceous tint, with black outer marginal fine border and black cilia, a rather broad black tail at the end of vein 2, a slight angular, black projection at the end of vein 1, abdominal space pale. Underside. Forewing with the basal half above the median vein dark violet-brown, the outer portion above that vein somewhat paler, the lower portion of the wing pale ochreous brown; a large round spot inside the cell near the base, a large bar in the middle, and another, larger still, at the end, very slightly darker than the ground colour, formed by their very prominent pale blue edgings, a small pale ringed spot on the costa, above the outer bar, an oblique angled spot below it on its inner side, a round spot below the middle bar, both edged with pale blue, a discal band of large conjoined more or less square spots increasing in size hindwards to vein 2, where it is joined on its inner edge to a large square spot in the next interspace, all edged on both sides with whitish; a sub... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Thiruvananthapuram | 🇮🇳 India | |
| 2 | Thrissur | 🇮🇳 India | |
| 3 | Kozhikode | 🇮🇳 India | |
| 4 | Denpasar | 🇮🇩 Indonesia | |
| 5 | Singapore | 🇸🇬 Singapore | |
| 6 | Kochi | 🇮🇳 India | |
| 7 | Jakarta | 🇮🇩 Indonesia | |
| 8 | Bandung | 🇮🇩 Indonesia | |
| 9 | Kuala Lumpur | 🇲🇾 Malaysia | |
| 10 | Bangkok | 🇹🇭 Thailand |
Possible
About 20% of wildlife watchers report a Dull Oak-Blue sighting in Thrissur on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 68th most-seen of the 93 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
In that month about 60% of wildlife watchers report a Dull Oak-Blue in Thrissur on a given day, against under 5% in May–August and October–March, the lowest months. That is one of Thrissur's driest months, with about 100 mm of rain against 440 mm in June.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Dull Oak-Blue 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 10 cities where we can rate Dull Oak-Blue sightings, Thrissur ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Thiruvananthapuram (India, about 20%).
Same family: Lycaenidae
The closest relatives of the Dull Oak-Blue that you can see in Thrissur (family Lycaenidae, Gossamer-winged Butterflies) are Common Pierrot (about 30%), Tiny Grass Blue (about 30%) and Plains Cupid (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dull Oak-Blue is recorded against all the insects logged in Thrissur (6 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.
