Polyura schreiber
In 3 days ~10% in a week ~30%
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 Blue Nawab sighting in Singapore on a given day, based on 61 verified sightings from GBIF citizen-science data. It is the 313th 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 30%, if each day is a fresh chance.
January–February and September–November
In those months about 10% of wildlife watchers report a Blue Nawab in Singapore on a given day, against under 5% in March–August and December, the lowest months.
Only Singapore, in our data
Singapore is the only city on Wallace's Line with enough records to rate Blue Nawab sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Blue Nawab is recorded against all the insects logged in Singapore (61 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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