Chironius bicarinatus
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~10% in a week ~30%
Chironius bicarinatus, the two-headed sipo, is a species of snake in the family Colubridae. The species is found in Brazil, Argentina, Uruguay, and Paraguay. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tijuca National Park | 🇧🇷 Brazil |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Rio de Janeiro | 🇧🇷 Brazil | |
| 2 | São Paulo | 🇧🇷 Brazil |
Rare
Under 5% of wildlife watchers report a Two-headed Sipo sighting in São Paulo on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 14th most-seen of the 23 reptiles we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
March–April, October and December–January
In those months about 10% of wildlife watchers report a Two-headed Sipo in São Paulo on a given day, against under 5% in February, May–September and November, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Two-headed Sipo sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 cities where we can rate Two-headed Sipo sightings, São Paulo ranks 2nd at under 5%. The best odds are in Rio de Janeiro (Brazil, about 10%).
Same family: Colubridae
The closest relatives of the Two-headed Sipo that you can see in São Paulo (family Colubridae, Colubrid Snakes) are Pampas Snake (about 10%), Brazilian Slug-eating Snake (about 10%) and Military Ground Snake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Two-headed Sipo is recorded against all the reptiles logged in São Paulo (15 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.
