Silhouette: Mattia Menchetti · PhyloPic
Polyura schreiberi
In 3 days ~10% in a week ~20%
Polyura schreiber, the blue nawab, is a butterfly species found in tropical Asia. It belongs to the Charaxinae (rajahs and nawabs) in the brush-footed butterfly family (Nymphalidae). It occurs from south India and Assam through Myanmar, Tenasserim, and Southeast Asia to southern China and to Java, Indonesia.
The South Indian subspecies: Male has upperside ground colour black, glossed slightly with dull indigo-blue, or, in some specimens, light green at the base of the wings. Forewings and hindwings with a broad white discal bar from interspace 4 in forewing to just below the apex of the median vein in the hindwing, narrowing on the latter wing to a point. This bar has, on the outer side on both forewings and hindwings, an irregular border of small-blue, which is narrowest anteriorly and broadens posteriorly respectively on both forewings and hindwings. Forewing with, in addition, a white rectangular spot in interspace 5 and a small whitish speck above it. Hindwing with a subterminal row of small white dots, a terminal row of deep ochraceous spots, and some small-blue markings on the tails and margins near the tornal angle. Underside... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Singapore | 🇸🇬 Singapore |
Rare
Under 5% of wildlife watchers report a Polyura schreiberi sighting in Singapore on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 708th most-seen of the 1045 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Polyura schreiberi in Singapore on a given day, so our monthly data shows no clear season.
Only Singapore, in our data
Singapore is the only city on Wallace's Line with enough records to rate Polyura schreiberi sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Polyura schreiberi is recorded against all the insects logged in Singapore (11 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.
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