Ancema blanka
In 3 days ~10% in a week ~20%
Ancema blanka, the silver royal, is a species of lycaenid or blue butterfly found in the Indomalayan realm. The species was first described by Lionel de Nicéville in 1894. Lionel de Nicéville described this species in 1894 as:
Female. Upperside, forewing with the costa at the base very narrowly, the apex very widely, the outer margin decreasingly black; the rest of the wing rather light clear blue. Hindwing with the costa broadly fuscous; the apex widely, the outer margin narrowly black; the abdominal margin as far as the submedian nervure whitish the rest of the wing blue; the anal lobe small, black, crowned with a few blue scales, the lobe anteriorly bearing against it a white fascia the tails rather short, black, tipped with white, the longer one from the termination of the first median nervule, the shorter from the submedian nervure. Cilia black throughout. Underside, forewing immaculate drab, the inner margin extending broadly on to the disc dull ochreous. Hindwing drab; with an irregular outer discal dark line outwardly defined by white from the abdominal margin to the third median nervule; a small oval black spot on the margin in the first median inter-space... 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 Silver Royal sighting in Hong Kong on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 613th most-seen of the 1125 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
September to December
In those months about 10% of wildlife watchers report a Silver Royal in Hong Kong on a given day, against under 5% in January to August, the lowest months. Those are among Hong Kong's driest months, with about 65 mm of rain a month against 280 mm in June.
2nd of 3
Of the 3 cities where we can rate Silver Royal sightings, Hong Kong ranks 2nd at under 5%. The best odds are in Tuen Mun (China, about 10%).
Same family: Lycaenidae
The closest relatives of the Silver Royal that you can see in Hong Kong (family Lycaenidae, Gossamer-winged Butterflies) are Pale Grass Blue (about 20%), Plains Cupid (about 20%) and Abisara echeria (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Silver Royal is recorded against all the insects logged in Hong Kong (13 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.
