Lytta vesicatoria
In 3 days ~30% in a week ~50%
Lytta vesicatoria, also known as the Spanish fly, is an aposematic emerald-green beetle in the blister beetle family (Meloidae). It is distributed across Eurasia. The species and others in its family were used in traditional apothecary preparations as "Cantharides". The insect is the source of the terpenoid cantharidin, a toxic blistering agent once used as an exfoliating agent, anti-rheumatic drug and an aphrodisiac. The substance has also found culinary use in some blends of the North African spice mix ras el hanout. Its various supposed benefits have been responsible for accidental poisonings.
The generic name is from the Greek λύττα (lytta), meaning martial rage, raging madness, Bacchic frenzy, or rabies. The specific name is derived from Latin vesica, bladder. Lytta vesicatoria was formerly named Cantharis vesicatoria, although the genus Cantharis is in an unrelated family, Cantharidae, the soldier beetles. It was classified there erroneously until the Danish zoologist Johan Christian Fabricius corrected its name in his Systema entomologiae in 1775. He reclassified the Spanish fly as the type species of the new genus Lytta, in the family Meloidae.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 2 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kyiv | 🇺🇦 Ukraine | |
| 2 | Almaty | 🇰🇿 Kazakhstan | |
| 3 | Novosibirsk | 🇷🇺 Russia | |
| 4 | Vienna | 🇦🇹 Austria |
With luck
About 10% of wildlife watchers report a Spanish Fly sighting in Sierra de Guadarrama National Park on a given day, based on 48 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 81st most-seen of the 597 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
May
In that month about 30% of wildlife watchers report a Spanish Fly in Sierra de Guadarrama National Park on a given day, against under 5% in July to March, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Spanish Fly sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Spanish Fly sightings, Sierra de Guadarrama National Park has the highest daily chance: about 10%. Next come Pyrénées National Park (France, under 5%).
Same family: Meloidae
The closest relatives of the Spanish Fly that you can see in Sierra de Guadarrama National Park (family Meloidae, Blister Beetles) are Physomeloe corallifer (about 20%), Four-Spotted Blisterbeetle (about 10%) and Mylabris hieracii (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Spanish Fly is recorded against all the insects logged in Sierra de Guadarrama National Park (48 verified sightings from 2019 to 2026), 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.
