Byasa mencius
In 3 days ~20% in a week ~40%
Byasa mencius is a butterfly from the family Papilionidae (swallowtails). It is found in China. The species was first described by Cajetan Felder and Rudolf Felder in 1862. The wingspan is 10–11 cm. The wings are dark brown with chain of large red spots on the hindwings. The underside of the body is covered in red hairs.
The larvae feed on Cocullus carolinus. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Byasa mencius sighting in Nanjing on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 123rd most-seen of the 272 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
August
In that month about 20% of wildlife watchers report a Byasa mencius in Nanjing on a given day, against under 5% in November to May, the lowest months. That is one of Nanjing's wettest months, with about 160 mm of rain against 40 mm in December.
Yes
Of the 2 cities where we can rate Byasa mencius sightings, Nanjing has the highest daily chance: about 10%. Next come Beijing (China, under 5%).
GBIF citizen-science records
It is estimated from how often the Byasa mencius is recorded against all the insects logged in Nanjing (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.
