Birrima varians
In 3 days ~30% in a week ~50%
Birrima varians is a species or species complex of cicadas, also known as the black tree-ticker, in the true cicada family, Cicadettinae subfamily and Cicadettini tribe. It is endemic to Australia. It was described in 1834 by German entomologist Ernst Friedrich Germar. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
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 Black Tree-Ticker sighting in Brisbane on a given day, based on 150 verified sightings from GBIF citizen-science data. It is the 108th most-seen of the 1083 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.
December
In that month about 20% of wildlife watchers report a Black Tree-Ticker in Brisbane on a given day, against under 5% in March to July, the lowest months. That is one of Brisbane's wettest months, with about 130 mm of rain against 40 mm in July.
Only Brisbane, in our data
Brisbane is the only city on Wallace's Line with enough records to rate Black Tree-Ticker sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Cicadidae
The closest relatives of the Black Tree-Ticker that you can see in Brisbane (family Cicadidae, Typical Cicadas) are Brown Bunyip (about 10%), Clanger (about 10%) and Floury Baker (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Tree-Ticker is recorded against all the insects logged in Brisbane (150 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.
