Helophilus latifrons
In 3 days ~10% in a week ~20%
Helophilus latifrons (Loew, 1863), the Broad-headed Marsh Fly, is a species of syrphid fly observed throughout the United States, in lower Canada and the mountains on Mexico. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers from which they get both energy-giving nectar and protein rich pollen. The larvae are aquatic feeding on decaying vegetation. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Calgary | 🇨🇦 Canada | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Sacramento | 🇺🇸 United States | |
| 4 | Denver | 🇺🇸 United States | |
| 5 | Edmonton | 🇨🇦 Canada | |
| 6 | Montreal | 🇨🇦 Canada | |
| 7 | Toronto | 🇨🇦 Canada | |
| 8 | San Francisco | 🇺🇸 United States | |
| 9 | Los Angeles | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Broad-Headed Marsh Fly sighting in Calgary on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 122nd most-seen of the 256 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.
July
In that month about 10% of wildlife watchers report a Broad-Headed Marsh Fly in Calgary on a given day, against under 5% in August to June, the lowest months.
Yes
Of the 9 cities where we can rate Broad-Headed Marsh Fly sightings, Calgary has the highest daily chance: under 5%. Next come Minneapolis [Saint Paul] (United States, under 5%) and Sacramento (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Broad-Headed Marsh Fly is recorded against all the insects logged in Calgary (15 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.
