Euleia heraclei
In 3 days ~20% in a week ~30%
Euleia heraclei, known as the celery fly or the hogweed picture-wing fly, is a species of tephritid or fruit flies in the family Tephritidae. This species is widespread in most of Europe (Austria, Belgium. Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Great Britain, Greece, Hungary, Ireland, Italy, Latvia, Moldova, the Netherlands, Norway, Poland, Romania, central European Russia, Slovakia, Spain, Switzerland, Sweden, and Ukraine) and in the eastern Palearctic realm, in Central Asia (Afghanistan, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan), and Japan. It is also present in North Africa (Algeria, Morocco) and in the Middle East (Turkey, Armenia, Azerbaijan, Georgia, Iran, Israel).
In Britain, the species is distributed widely across southern and central England; in Wales records are mainly near the coast. These small flies mainly inhabit vegetable gardens and open countrysides where the host plants grow.
Euleia heraclei can reach a body length of 5–7 mm (0.20–0.28 in). The species is dimorphic, as the color of the body is variable depending on the season. In fact the thorax and the abdomen... Wikipedia →
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Celery Fly sighting in London on a given day, based on 52 verified sightings from GBIF citizen-science data. It is the 457th most-seen of the 1504 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
April–May and October–December
In those months about 10% of wildlife watchers report a Celery Fly in London on a given day, against under 5% in January–March and June–September, the lowest months.
Yes
Of the 6 cities where we can rate Celery Fly sightings, London has the highest daily chance: about 10%. Next come Istanbul (Turkey, about 10%) and Liverpool (United Kingdom, about 10%).
GBIF citizen-science records
It is estimated from how often the Celery Fly is recorded against all the insects logged in London (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.
