Achaea janata
In 3 days ~30% in a week ~50%
Achaea janata, the castor semi-looper or croton caterpillar, is an erebid moth, the caterpillars of which are termed 'semi-loopers' due to their mode of locomotion. It is found from the Indo-Australian tropics and subtropics, extending south to New Zealand and east through the Pacific archipelagoes to Easter Island. It is a major pest of castor throughout the world.
Its wingspan is about 60–70 mm. The species has a pale reddish-brown body. Forewings with prominent markings. A short sub-basal waved line and an obliquely waved antemedial and excised postmedial lines are present. Postmedial lines are often black suffused inside them. A speck is found at the end of the cell. A diffuse rufous band runs beyond the postmedial line, Hindwings black with medial white band. Three large white spots can be seen on outer margin, with whitish cilia. Ventral side grey suffused. Forewings with an oblique white postmedial band not reaching the costa. Two crenulate medial lines found on each wing.
Eggs are small, spherical with a greenish color. Pupa is whitish green. Larva bluish grey speckled with blue black. Head black striped. Lateral and sub-lateral yellowish bands with intervening... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Daintree National Park | 🇦🇺 Australia | |
| 2 | Springbrook National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Castor Semi-Looper sighting in Springbrook National Park on a given day, based on 16 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 112th most-seen of the 429 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
April
In that month about 30% of wildlife watchers report a Castor Semi-Looper in Springbrook National Park on a given day, against under 5% in February, June–July and September–December, the lowest months.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Castor Semi-Looper sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 2 parks where we can rate Castor Semi-Looper sightings, Springbrook National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Daintree National Park (Australia, about 10%).
Same family: Erebidae
The closest relatives of the Castor Semi-Looper that you can see in Springbrook National Park (family Erebidae, Underwing, Tiger, Tussock, and Allied Moths) are Eilema plana (about 20%), Asian Magpie Moth (about 20%) and Jute Looper (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Castor Semi-Looper is recorded against all the insects logged in Springbrook National Park (16 verified sightings from 2019 to 2026), 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.
