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 Minneapolis [Saint Paul] on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 320th most-seen of the 672 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.
September
In that month about 10% of wildlife watchers report a Broad-Headed Marsh Fly in Minneapolis [Saint Paul] on a given day, against under 5% in October to August, the lowest months.
Among the best
Of the 9 cities where we can rate Broad-Headed Marsh Fly sightings, Minneapolis [Saint Paul] ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Calgary (Canada, 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 Minneapolis [Saint Paul] (17 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.
