Crotalus durissus
Silhouette: Bill Bouton (source photo) & T. Michael Keesey (vectorization) · PhyloPic
In 3 days ~90% in a week >90%
Crotalus durissus, known as the South American rattlesnake, tropical rattlesnake, and by other names, is a highly venomous pit viper species found in South America. It is the most widely distributed member of its genus. Currently, seven subspecies are recognized.
Table notes: A large Neotropical rattlesnake, it grows to a length of 1.5 m (4.9 ft), and rarely to a maximum length of 1.9 m (6.2 ft). It has two distinct stripes starting at the base of the head. Within the lines, the color is lighter than the stripes.
The color and pattern of the body are... Wikipedia →
Recording0:41
Brazil · 2024
© Breno Farias · iNaturalist · CC BY-NC 4.0
Recording0:13
Brazil · 2026
© Matheus M. Santos · iNaturalist · CC BY-NC 4.0
Recording0:23
Brazil · 2026
© Ana Laura Campioto · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Emas National Park | 🇧🇷 Brazil | |
| 2 | Serra da Canastra National Park | 🇧🇷 Brazil | |
| 3 | Chapada Diamantina National Park | 🇧🇷 Brazil | |
| 4 | Iguazú National Park | 🇦🇷 Argentina | |
| 5 | Iguaçu National Park | 🇧🇷 Brazil |
Likely
About 50% of wildlife watchers report a Neotropical Rattlesnake sighting in Emas National Park on a given day, based on 33 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 3rd most-seen of the 11 reptiles we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
March and April
In those months about 70% of wildlife watchers report a Neotropical Rattlesnake in Emas National Park on a given day, against about 30% in January, the lowest month.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Neotropical Rattlesnake sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 5 parks where we can rate Neotropical Rattlesnake sightings, Emas National Park has the highest daily chance: about 50%. Next come Serra da Canastra National Park (Brazil, about 30%) and Chapada Diamantina National Park (Brazil, about 20%).
Same family: Viperidae
The closest relatives of the Neotropical Rattlesnake that you can see in Emas National Park (family Viperidae, Vipers) are Cerrado Lancehead (about 50%), Urutu Lancehead (about 40%) and Brazilian Lancehead (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Neotropical Rattlesnake is recorded against all the reptiles logged in Emas National Park (33 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.
