Crotalus durissus
Silhouette: Bill Bouton (source photo) & T. Michael Keesey (vectorization) · PhyloPic
In 3 days ~60% 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 |
Possible
About 30% of wildlife watchers report a Neotropical Rattlesnake sighting in Serra da Canastra National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 4th most-seen of the 8 reptiles we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
February
In that month about 60% of wildlife watchers report a Neotropical Rattlesnake in Serra da Canastra National Park on a given day, against under 5% in July to October, the lowest months. That is one of Serra da Canastra National Park's wettest months, with about 250 mm of rain against almost none in July.
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.
2nd of 5
Of the 5 parks where we can rate Neotropical Rattlesnake sightings, Serra da Canastra National Park ranks 2nd at about 30%. The best odds are in Emas National Park (Brazil, about 50%).
GBIF citizen-science records
It is estimated from how often the Neotropical Rattlesnake is recorded against all the reptiles logged in Serra da Canastra National Park (6 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.
