Holcocephala calva
In 3 days ~10% in a week ~20%
Holcocephala calva is a species of robber fly in the family Asilidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chicago | 🇺🇸 United States | |
| 2 | Montreal | 🇨🇦 Canada | |
| 3 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Gray Goggle Eye sighting in Chicago on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 637th most-seen of the 978 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Gray Goggle Eye in Chicago on a given day, so our monthly data shows no clear season.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Gray Goggle Eye sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 3 cities where we can rate Gray Goggle Eye sightings, Chicago has the highest daily chance: under 5%. Next come Montreal (Canada, under 5%) and Washington (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Gray Goggle Eye is recorded against all the insects logged in Chicago (10 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.
