Promachus yesonicus
In 3 days ~40% in a week ~70%
Promachus yesonicus, or shioya-abu (塩屋虻, シオヤアブ) in Japanese, is a species of robber flies. In Japanese, "shioya" means a salt merchant (someone who makes or deals in salt), and "abu" means a horse-fly. This insect is called "shioya-abu" because the males have a white tip to their tail that resembles salt. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Promachus yesonicus sighting in Osaka on a given day, based on 82 verified sightings from GBIF citizen-science data. It is the 22nd most-seen of the 352 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
July
In that month about 40% of wildlife watchers report a Promachus yesonicus in Osaka on a given day, against under 5% in September to April, the lowest months. That is one of Osaka's wettest months, with about 200 mm of rain against 55 mm in January.
Among the best
Of the 7 cities where we can rate Promachus yesonicus sightings, Osaka ranks 3rd at about 20%, level with the leaders once rounded. The best odds are in Daejeon (South Korea, about 20%) and Hiroshima (Japan, about 20%).
Same order: Diptera
The closest relatives of the Promachus yesonicus that you can see in Osaka (order Diptera, Flies) are Greater Bee Fly (about 10%), Black Soldier Fly (about 10%) and Phytomia zonata (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Promachus yesonicus is recorded against all the insects logged in Osaka (82 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.
