Cressida cressida
In 3 days ~30% in a week ~50%
Cressida cressida, the clearwing swallowtail or big greasy, is a Troidine swallowtail butterfly found in northern Australia, New Guinea, Maluku, and Timor. It is in the monotypic genus Cressida. Remarkably, this species is not particularly closely related to other Asian swallowtails, but instead seems to be the closest living relative of the peculiar South American swallowtails of genus Euryades.
Johann Fabricius acquired the first specimens of this species from Joseph Banks, who collected them at the site of present-day Cooktown in 1770. Fabricius described the male and female as Papilio cressida and P. harmonia respectively, under the premise that the two were different species. The original specimens now reside in the Natural History Museum, London. Both male and female now possess the same name, cressida, however, this species is no longer placed in the genus Papilio, but in the genus Cressida. The systematics of the genus is as follows: Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kakadu National Park | 🇦🇺 Australia |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Brisbane | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Big Greasy sighting in Kakadu National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 62nd most-seen of the 76 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.
February
In that month about 40% of wildlife watchers report a Big Greasy in Kakadu National Park on a given day, against under 5% in March–April and June–January, the lowest months. That is one of Kakadu National Park's wettest months, with about 290 mm of rain against almost none in August.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Big Greasy sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Kakadu National Park, in our data
Kakadu National Park is the only park on Wallace's Line with enough records to rate Big Greasy sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Papilionidae
The closest relatives of the Big Greasy that you can see in Kakadu National Park (family Papilionidae, Swallowtails and Parnassians) are Great Jay (about 20%) and Lime Swallowtail (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Big Greasy is recorded against all the insects logged in Kakadu National Park (6 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.
