Nacaduba berenice
In 3 days ~10% in a week ~20%
Nacaduba berenice, the rounded six-line blue, is a lycaenid butterfly found in Indomalayan realm. The species was first described by Gottlieb August Wilhelm Herrich-Schäffer in 1869. Male upperside: dull purplish blue, in certain lights with a shining plumbeous (lead-coloured) frosting. Forewings and hindwings: black anteciliary lines and on the hindwing the black subterminal spot in interspace 2 on the underside apparent by transparency. Underside: purplish grey. Forewing: a pair of curved white lines from costa transversely across the cell to vein 1, a short similar line on the inner side of the discocellulars followed by three transverse discal similar lines from costa to vein 1, an inner and outer transverse subterminal series of slender white lunules and an anteciliary dark brown line. Hindwing: crossed transversely by three slender broken lines, with a short line on the inner side of the discocellulars between the outer two; these are followed by a discal and a postdiscal less broken and interrupted similar lines, a double series of slender white lunules and a dark anteciliary line as on the forewing. Cilia of both forewings and hindwings... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Noosa National Park | 🇦🇺 Australia | |
| 2 | Lamington National Park | 🇦🇺 Australia |
Rare
Under 5% of wildlife watchers report a Rounded Sixline Blue sighting in Hong Kong on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 680th 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–October and December
In those months about 10% of wildlife watchers report a Rounded Sixline Blue in Hong Kong on a given day, against under 5% in January–August and November, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Rounded Sixline Blue sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 cities where we can rate Rounded Sixline Blue sightings, Hong Kong ranks 4th at under 5%. The best odds are in Brisbane (Australia, about 20%), Singapore (Singapore, about 10%) and Tuen Mun (China, about 10%).
GBIF citizen-science records
It is estimated from how often the Rounded Sixline Blue is recorded against all the insects logged in Hong Kong (12 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.
