Eurema smilax
In 3 days ~20% in a week ~40%
Eurema smilax, the small grass yellow, is a small pierid butterfly species found in Australia, with some additional records from India, Indonesia and Niger. The wingspan is about 30 mm. The larvae mostly feed on plants of the Senna and Neptunia genera.
The species was first described by Edward Donovan in 1805. Eurema smilax adults have a wingspan of 30–34 mm, with females being slightly larger than males. They are yellow, with black tips on the upper surface of the forewings. This colouration can vary depending on flight period. In southern Australia, the summer flying forms are usually pale yellow, with few or no brown markings on the wing undersides. The winter forms are a brighter yellow, with pronounced brown markings on the wing undersides. The males are generally a brighter yellow than the females.
The eggs are initially white, later turning yellowish. They are spindle-shaped, with a height of about 1.2 mm, and laid singly on a host plant. They hatch in about 7–11 days during spring. The caterpillar is initially pale yellow, soon becoming greenish. Third and fourth instars develop a darker dorsal line and a yellow lateral line. Mature larvae are... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Flinders Ranges National Park | 🇦🇺 Australia | |
| 2 | Uluru-Kata Tjuta National Park | 🇦🇺 Australia | |
| 3 | Lamington National Park | 🇦🇺 Australia | |
| 4 | Blue Mountains National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Small Grass-Yellow sighting in Lamington National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 308th most-seen of the 430 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.
September
In that month about 20% of wildlife watchers report a Small Grass-Yellow in Lamington National Park on a given day, against under 5% in May–June, August, October and December–March, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Small Grass-Yellow sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 4
Of the 4 parks where we can rate Small Grass-Yellow sightings, Lamington National Park ranks 3rd at about 10%. The best odds are in Flinders Ranges National Park (Australia, about 30%) and Uluru-Kata Tjuta National Park (Australia, about 10%).
GBIF citizen-science records
It is estimated from how often the Small Grass-Yellow is recorded against all the insects logged in Lamington National Park (7 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.
