Sepedon sphegea
In 3 days ~10% in a week ~20%
Sepedon sphegea is a Palearctic species of fly in the family Sciomyzidae, the marsh flies or snail-killing flies. The larva feeds on aquatic snails and as an opportunist on other invertebrates. The habitat of this species includes among many others, pond margins and damp meadows. It has a particular fondness for Iris pseudacorus which grow at the edges of the pond. Adults can be found all year long but the main flight period is from March to October. 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 Blue Long-Horned Snailkiller 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 Blue Long-Horned Snailkiller in London on a given day, so our monthly data shows no clear season.
Among the best
Of the 3 cities where we can rate Blue Long-Horned Snailkiller sightings, London ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Chennai (India, under 5%) and Paris (France, under 5%).
GBIF citizen-science records
It is estimated from how often the Blue Long-Horned Snailkiller 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.
