Criorhina nigripes
In 3 days ~10% in a week ~20%
Criorhina nigripes is a species of hoverfly in the family Syrphidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Williston's Bumble Fly sighting in Portland on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 316th most-seen of the 507 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.
February and March
In those months about 10% of wildlife watchers report a Williston's Bumble Fly in Portland on a given day, against under 5% in April to January, the lowest months.
Yes
Of the 2 cities where we can rate Williston's Bumble Fly sightings, Portland has the highest daily chance: under 5%. Next come Seattle (United States, under 5%).
Same family: Syrphidae
The closest relatives of the Williston's Bumble Fly that you can see in Portland (family Syrphidae, Hover Flies) are Yellow-Haired Sun Fly (about 10%), Narcissus Bulb Fly (about 10%) and Eurasian Drone Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Williston's Bumble Fly is recorded against all the insects logged in Portland (11 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.
