Horaga onyx
In 3 days ~10% in a week ~30%
Horaga onyx, the common onyx, is a species of lycaenid or blue butterfly found in the Indomalayan realm. The butterfly is mostly seen in India (Western Ghats, Maharashtra southwards, Himachal Pradesh to Arunachal Pradesh) and also in Nepal, Bhutan, Bangladesh, Myanmar and Sri Lanka. It is also Peninsular Malaya, Borneo, Singapore, Langkawi, Java, Sumatra, Bangka Hong Kong and the Philippines.
Locally common. Coriaria nepalensis (Coriariaceae). Mangifera indica Male. Upperside cyaneous-blue. Forewing with a patch of white outside the end of the cell, divided into 4 by veins 2, 3 and 4, the upper piece the smallest, the spot below vein 4 small; the costa with a black band, narrow at the base, increasing in width outwards, occupying the whole apical space beyond the white patch, and broadly down the outer margin. Hindwing with the costal area broadly blackish, a narrow macular, outer marginal black band, terminal black line, anteciliary bluish white thread; tails black, tipped with white. Cilia of both wings black, tipped with white on the hindwing and at the hinder angle of the forewing. Underside pale ferruginous... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Common Onyx sighting in Tuen Mun on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 492nd most-seen of the 557 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
April–June, September and December
In those months about 10% of wildlife watchers report a Common Onyx in Tuen Mun on a given day, against under 5% in January–March, July–August and October–November, the lowest months.
Yes
Of the 3 cities where we can rate Common Onyx sightings, Tuen Mun has the highest daily chance: under 5%. Next come Hong Kong (China, under 5%) and Singapore (Singapore, under 5%).
Same family: Lycaenidae
The closest relatives of the Common Onyx that you can see in Tuen Mun (family Lycaenidae, Gossamer-winged Butterflies) are Pale Grass Blue (about 30%), Common Hedge Blue (about 30%) and Chocolate Royal (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Onyx is recorded against all the insects logged in Tuen Mun (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.
