Ariadne ariadne
In 3 days ~20% in a week ~30%
Ariadne ariadne, the angled castor, is a species of nymphalid butterfly found in Asia. This butterfly is orange brown with wavy lines running across its wings. The margin is somewhat wavy and appears truncated at the apex of the forewing. The margin is wavy with a large angle present on the fifth vein interspace and at the tip of vein three. The tornus is broadly angulate. The hindwing termen is deeply scalloped. A prominent white spot appears towards the apex of the forewing. The cilia are white, alternated with brown. On the underside there is more brown.
The antennae, head, thorax and abdomen are ochraceous rufous. Males have a series of dark shining scales (androconia) on the subcostal vein, veins 6 and 7 and a patch on the underside of the forewing towards the base. Females look similar but are slightly paler and lacking the androconial scales.
A, ariadne bears resemblance to Ariadne merione, the common castor, but in the angled castor, the transverse chestnut bands are narrower and less diffuse. The margins of the common castor are less wavy. The castor plant (Ricinus communis) is the most common host and gives the butterfly its name. Other hosts... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Salem | 🇮🇳 India | |
| 2 | Kozhikode | 🇮🇳 India | |
| 3 | Ponnani | 🇮🇳 India | |
| 4 | Thrissur | 🇮🇳 India | |
| 5 | Thiruvananthapuram | 🇮🇳 India | |
| 6 | Yogyakarta | 🇮🇩 Indonesia | |
| 7 | Tuen Mun | 🇨🇳 China | |
| 8 | Taichung | 🇹🇼 Taiwan | |
| 9 | Tainan | 🇹🇼 Taiwan | |
| 10 | Chennai | 🇮🇳 India |
With luck
About 10% of wildlife watchers report an Angled Castor sighting in Kolkata on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 193rd most-seen of the 213 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
April and September–November
In those months about 10% of wildlife watchers report an Angled Castor in Kolkata on a given day, against under 5% in May–August and December–March, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Angled Castor sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
16th of 18
Of the 18 cities where we can rate Angled Castor sightings, Kolkata ranks 16th at about 10%. The best odds are in Salem (India, about 40%), Kozhikode (India, about 20%) and Ponnani (India, about 10%).
GBIF citizen-science records
It is estimated from how often the Angled Castor is recorded against all the insects logged in Kolkata (6 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.
