Osca lata
In 3 days ~80% in a week >90%
Osca lata, the coliguacho, tábano or black horse fly, is a large horse fly whose range includes southern Chile and southern Argentina. Previously known as Scaptia lata, it has a striking reddish-orange coloration on the side of its thorax and abdomen. It is generally around 2 cm. in adult size.
Like most species of horse flies, the females of Osca lata need to feed on mammalian blood before they can produce eggs. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Vicente Pérez Rosales National Park | 🇨🇱 Chile | |
| 2 | Nahuel Huapi National Park | 🇦🇷 Argentina |
No species of the same family or order lives in Vicente Pérez Rosales National Park, so these are its closest relatives here: other insects.
Likely
About 40% of wildlife watchers report an Osca lata sighting in Vicente Pérez Rosales National Park on a given day, based on 21 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 2nd most-seen of the 8 insects we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
January
In that month about 80% of wildlife watchers report an Osca lata in Vicente Pérez Rosales National Park on a given day, against under 5% in February–March and November, the lowest months. That is one of Vicente Pérez Rosales National Park's driest months, with about 100 mm of rain against 490 mm in June.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Osca lata sightings with a recorded time, and about 9 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 Osca lata sightings, Vicente Pérez Rosales National Park has the highest daily chance: about 40%. Next come Nahuel Huapi National Park (Argentina, about 10%).
GBIF citizen-science records
It is estimated from how often the Osca lata is recorded against all the insects logged in Vicente Pérez Rosales National Park (21 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.
