Micrurus altirostris
Silhouette: Edwin Price · PhyloPic
In 3 days ~30% in a week ~50%
Micrurus altirostris, also known commonly as the Uruguayan coral snake, is a species of venomous snake in the family Elapidae. The species is native to southeastern South America. Micrurus altirostris is found in northeastern Argentina, extreme southern Brazil, eastern Paraguay, and Uruguay.
The preferred natural habitat of Micrurus altirostris is forest, but it is also found less abundantly in savanna and grassland. Its altitudinal range is from near sea level to around 400 m (1,300 ft). Micrurus altirostris is terrestrial, foraging in plant litter.
Micrurus altirostris preys upon amphisbaenians and snakes. Micrurus altirostris is oviparous. Micrurus altirostris possesses a potent venom. The estimated lethal dose is 5–7 mg for an adult human. When live specimens were "milked" in a laboratory, the average venom yield was 8–10 mg. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Iguazú National Park | 🇦🇷 Argentina | |
| 2 | Iguaçu National Park | 🇧🇷 Brazil |
With luck
About 10% of wildlife watchers report an Uruguayan Coral Snake sighting in Iguaçu National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 17 reptiles 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.
August and October–November
In those months about 20% of wildlife watchers report an Uruguayan Coral Snake in Iguaçu National Park on a given day, against under 5% in February, May–July and December, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Uruguayan Coral Snake sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 2 parks where we can rate Uruguayan Coral Snake sightings, Iguaçu National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Iguazú National Park (Argentina, about 10%).
GBIF citizen-science records
It is estimated from how often the Uruguayan Coral Snake is recorded against all the reptiles logged in Iguaçu National Park (10 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.
