Cyclochila australasiae
In 3 days ~80% in a week >90%
Cyclochila australasiae is a species of cicada and one of Australia's most familiar insects. It is distributed through coastal regions of southeastern Australia. Green specimens are commonly known as green grocers and yellow ones as yellow mondays.
It is one of the loudest insects in the world. Cyclochila australasiae was first described as Tettigonia australasiae in 1805 by amateur zoologist Edward Donovan, who reported that it was common in New South Wales and many specimens had been collected and sent to England. Ernst Friedrich Germar named it Cicada olivacea in 1830. It was the second Australian species of cicada described after the double drummer (Thopha saccata).
It was formerly commonly known as the Great Green Cicada; in addition, the various colour forms have different vernacular names, including Yellow Monday for a common yellow morph; Chocolate Soldier for a rare dark tan form; Blue Moon for a rare turquoise form; and Masked Devil for its red-orange form. The names for the green and yellow forms have been recorded since at least 1896. Australian entomologist Walter Wilson Froggatt reported that the green form was known as green Monday (alongside yellow... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Blue Mountains National Park | 🇦🇺 Australia | |
| 2 | Grampians National Park | 🇦🇺 Australia | |
| 3 | Wilsons Promontory National Park | 🇦🇺 Australia | |
| 4 | Lamington National Park | 🇦🇺 Australia | |
| 5 | Springbrook National Park | 🇦🇺 Australia | |
| 6 | Royal National Park | 🇦🇺 Australia | |
| 7 | Kosciuszko National Park | 🇦🇺 Australia | |
| 8 | Great Otway National Park | 🇦🇺 Australia |
Likely
About 40% of wildlife watchers report a Green Grocer sighting in Blue Mountains National Park on a given day, based on 653 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the most-seen of the 789 insects we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
October
In that month about 80% of wildlife watchers report a Green Grocer in Blue Mountains National Park on a given day, against under 5% in February and April–August, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Green Grocer sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 8 parks where we can rate Green Grocer sightings, Blue Mountains National Park has the highest daily chance: about 40%. Next come Grampians National Park (Australia, about 30%) and Wilsons Promontory National Park (Australia, about 20%).
Same family: Cicadidae
The closest relatives of the Green Grocer that you can see in Blue Mountains National Park (family Cicadidae, Typical Cicadas) are Razor Grinder (about 20%), Floury Baker (about 20%) and Redeye Cicada (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Green Grocer is recorded against all the insects logged in Blue Mountains National Park (653 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.
