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 Vancouver on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 328th most-seen of the 482 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.
April
In that month about 10% of wildlife watchers report a Houdini Fly in Vancouver on a given day, against under 5% in May to March, the lowest months.
Among the best
Of the 6 cities where we can rate Houdini Fly sightings, Vancouver ranks 5th 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 Vancouver (10 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.
