What are the chances of seeing a Dark Cahill in Chicago?
Rare
Under 5% of wildlife watchers report a Dark Cahill sighting in Chicago on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 884th most-seen of the 978 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
When is the best time to see a Dark Cahill in Chicago?
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Dark Cahill in Chicago on a given day, so our monthly data shows no clear season.
Where else can you see a Dark Cahill?
Only Chicago, in our data
Chicago is the only city on Wallace's Line with enough records to rate Dark Cahill sightings: under 5% of wildlife watchers there report one on a given day.
Where does the Dark Cahill sighting chance come from?
GBIF citizen-science records
It is estimated from how often the Dark Cahill is recorded against all the insects logged in Chicago (5 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.