Prasinocyma rhodocosma
In 3 days ~10% in a week ~30%
Prasinocyma rhodocosma, the northern emerald, is a species of moth of the family Geometridae first described by Edward Meyrick in 1888. It is found in Australia in northern Western Australia, the Northern Territory, Queensland and New South Wales.
The wingspan is about 30 mm. The larvae feed on young shoots and leaves of Eucalyptus species Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Lamington National Park | 🇦🇺 Australia | |
| 2 | Blue Mountains National Park | 🇦🇺 Australia |
Rare
Under 5% of wildlife watchers report a Northern Emerald sighting in Perth on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 154th most-seen of the 275 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
November to January
In those months about 10% of wildlife watchers report a Northern Emerald in Perth on a given day, against under 5% in February to October, the lowest months. Those are among Perth's driest months, with about 20 mm of rain a month against 130 mm in July.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Northern Emerald sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
2nd of 2
Of the 2 cities where we can rate Northern Emerald sightings, Perth ranks 2nd at under 5%. The best odds are in Brisbane (Australia, about 10%).
GBIF citizen-science records
It is estimated from how often the Northern Emerald is recorded against all the insects logged in Perth (11 verified sightings), 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.
