Anasimyia bilinearis
In 3 days ~10% in a week ~20%
Anasimyia bilinearis, the two-lined swamp fly, is an uncommon species of syrphid fly observed throughout North America. 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. Larvae of this genus are of the rat-tailed type living in aquatic environments. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Two-Lined Swamp Fly sighting in Toronto on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 651st most-seen of the 1689 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 Two-Lined Swamp Fly in Toronto on a given day, so our monthly data shows no clear season.
Among the best
Of the 2 cities where we can rate Two-Lined Swamp Fly sightings, Toronto ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Boston (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Two-Lined Swamp Fly is recorded against all the insects logged in Toronto (26 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.
