Nacaduba biocellata
In 3 days ~70% in a week ~90%
Nacaduba biocellata, the double-spotted line blue, is a butterfly of the family Lycaenidae. It is found in Australia (including New South Wales, the Northern Territory, South Australia, Victoria and Western Australia), Singapore, the New Hebrides, Sumba and Bali.
The wingspan is about 20 mm. Adult females have a brown upperside, while the males are blue with narrow black margins. The underside of both sexes is pale brown with light and dark wavy lines. The larvae feed on the shoots, flowers and buds of various Acacia species, including A. aneura, A. betchei, A. brachybotrya, A. deanei, A. erinaceae, A. irrorata, A. karroo, A. ligulata, A. osswaldii, A. penninervis, A. rigens, A. salicina, A. sclerophylla, A. sowdenii and A. victoriae. They can have a wide range of colours depending on their host plant, including pink, orange, yellow or green. They are attended by ants, mostly Iridomyrmex species, including I. purpureus and I. viridiaeneus.
Pupation takes place in a pale brown pupa. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Uluru-Kata Tjuta National Park | 🇦🇺 Australia | |
| 2 | Flinders Ranges National Park | 🇦🇺 Australia | |
| 3 | Hattah-Kulkyne National Park | 🇦🇺 Australia | |
| 4 | Ningaloo Marine Park | 🇦🇺 Australia |
Possible
About 30% of wildlife watchers report a Double-Spotted Line Blue sighting in Uluru-Kata Tjuta National Park on a given day, based on 21 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 4th most-seen of the 38 insects we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
July
In that month about 60% of wildlife watchers report a Double-Spotted Line Blue in Uluru-Kata Tjuta National Park on a given day, against under 5% in January to April, the lowest months. That is one of Uluru-Kata Tjuta National Park's driest months, with almost no rain against 65 mm in January.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Double-Spotted Line Blue sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 4 parks where we can rate Double-Spotted Line Blue sightings, Uluru-Kata Tjuta National Park has the highest daily chance: about 30%. Next come Flinders Ranges National Park (Australia, about 20%) and Hattah-Kulkyne National Park (Australia, about 20%).
Same order: Lepidoptera
The closest relatives of the Double-Spotted Line Blue that you can see in Uluru-Kata Tjuta National Park (order Lepidoptera, Butterflies and Moths) are Plain Tiger Butterfly (about 40%), Australian Striped Hawk Moth (about 30%) and Lime Swallowtail (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Double-Spotted Line Blue is recorded against all the insects logged in Uluru-Kata Tjuta National Park (21 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.
