Chironius bicarinatus
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~20% in a week ~40%
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 |
With luck
About 10% of wildlife watchers report a Two-headed Sipo sighting in Rio de Janeiro on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 11th most-seen of the 16 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April, June and August–January
In those months about 10% of wildlife watchers report a Two-headed Sipo in Rio de Janeiro on a given day, against under 5% in February–March, May and July, 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.
Yes
Of the 2 cities where we can rate Two-headed Sipo sightings, Rio de Janeiro has the highest daily chance: about 10%. Next come São Paulo (Brazil, under 5%).
GBIF citizen-science records
It is estimated from how often the Two-headed Sipo is recorded against all the reptiles logged in Rio de Janeiro (10 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.
