Asemosyrphus polygrammus
In 3 days ~20% in a week ~40%
Asemosyrphus polygrammus, the common sickleleg or northern sickleleg, is a species of rat-tail maggot fly in the family Syrphidae. This species was formerly a member of the genus Lejops. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yosemite National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | Los Angeles | 🇺🇸 United States | |
| 3 | San Francisco | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Northern Sickleleg sighting in Sacramento on a given day, based on 52 verified sightings from GBIF citizen-science data. It is the 101st most-seen of the 386 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
February
In that month about 20% of wildlife watchers report a Northern Sickleleg in Sacramento on a given day, against under 5% in May–October and December, the lowest months. That is one of Sacramento's wettest months, with about 95 mm of rain against almost none in July.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Northern Sickleleg sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Northern Sickleleg sightings, Sacramento has the highest daily chance: about 10%. Next come Los Angeles (United States, under 5%) and San Francisco (United States, under 5%).
Same family: Syrphidae
The closest relatives of the Northern Sickleleg that you can see in Sacramento (family Syrphidae, Hover Flies) are Western Aphideater (about 20%), Margined Calligrapher (about 20%) and Oblique Streaktail (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Northern Sickleleg is recorded against all the insects logged in Sacramento (52 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.
