Cacoxenus indagator
In 3 days ~10% in a week ~20%
Cacoxenus indagator is a species of fruit fly native to central and southern Europe. It is a kleptoparasite, laying its eggs in the pollen-filled nest cells of mason bees. On account of its ability to break out of those cells once hatched, it is commonly known as the Houdini fly. 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 Houdini Fly sighting in London on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 1394th most-seen of the 1504 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 Houdini Fly in London on a given day, so our monthly data shows no clear season.
Among the best
Of the 6 cities where we can rate Houdini Fly sightings, London ranks 6th at under 5%, level with the leaders once rounded. The best odds are in Berlin (Germany, under 5%), Portland (United States, under 5%) and Vienna (Austria, under 5%).
GBIF citizen-science records
It is estimated from how often the Houdini Fly is recorded against all the insects logged in London (5 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.
