What are the chances of seeing a Walnut Husk Fly in San Francisco?
Rare
Under 5% of wildlife watchers report a Walnut Husk Fly sighting in San Francisco on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 443rd most-seen of the 737 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
When is the best time to see a Walnut Husk Fly in San Francisco?
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Walnut Husk Fly in San Francisco on a given day, so our monthly data shows no clear season.
Is San Francisco the best place to see a Walnut Husk Fly?
Among the best
Of the 4 cities where we can rate Walnut Husk Fly sightings, San Francisco ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Berlin (Germany, under 5%) and Portland (United States, under 5%).
Where does the Walnut Husk Fly sighting chance come from?
GBIF citizen-science records
It is estimated from how often the Walnut Husk Fly is recorded against all the insects logged in San Francisco (12 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.