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 Montreal on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 749th most-seen of the 926 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 Montreal 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.
Among the best
Of the 3 cities where we can rate Gray Goggle Eye sightings, Montreal ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Chicago (United States, under 5%).
Same family: Asilidae
The closest relatives of the Gray Goggle Eye that you can see in Montreal (family Asilidae, Robber Flies) are Stripe-Legged Robber Fly (about 10%) and Eastern Yellow-Backed Laphria (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Gray Goggle Eye is recorded against all the insects logged in Montreal (6 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.
