Crotalus scutulatus
Silhouette: Bill Bouton (source photo) & T. Michael Keesey (vectorization) · PhyloPic
In 3 days ~20% in a week ~50%
Crotalus scutulatus is species of rattlesnake, a venomous pit viper in the family Viperidae. The species is known commonly as the Mohave Rattlesnake. Other common English names include Mojave Rattlesnake and, referring specifically to the nominate (northern) subspecies: Northern Mohave Rattlesnake and Mojave Green Rattlesnake, the latter name commonly shortened to the more colloquial "Mojave green". Campbell and Lamar (2004) supported the English name "Mohave (Mojave) rattlesnake" with some reluctance because so little of the snake's range lies within the Mojave Desert. The spelling of the English name with an "h" has been advocated by multiple authors in recent years for various reasons. The most recent iteration of standard English names for North American reptiles, endorsed by the major herpetological societies in the United States and Canada, concludes that spelling with either a "j" or an "h" is correct, based on "whether the word is used in a Spanish or English context." Thus, their standard English names list adopted the "h" spelling.
Crotalus scutulatus is a highly venomous pitviper (family Viperidae, subfamily Crotalinae) found in the deserts of the southwestern United States and deep into mainland Mexico. It is perhaps best known for producing two distinctly different venom types in different populations.
Two subspecies are currently recognized. This account describes the widely distributed nominate subspecies, the Northern Mohave Rattlesnake, Crotalus scutulatus scutulatus. The other subspecies, C. scutulatus salvini, occurs in a relatively small area deep in mainland Mexico. Wikipedia →
Recording0:15
United States · 2023
Chris (CP) and Pamela (PP) Pipes · iNaturalist · CC0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States | |
| 2 | Saguaro National Park | 🇺🇸 United States | |
| 3 | Joshua Tree National Park | 🇺🇸 United States |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | San Diego Zoo | 🇺🇸 United States | |
| 2 | Omaha’s Henry Doorly Zoo and Aquarium | 🇺🇸 United States | |
| 3 | Phoenix Zoo | 🇺🇸 United States | |
| 4 | Detroit Zoo | 🇺🇸 United States | |
| 5 | Arizona-Sonora Desert Museum | 🇺🇸 United States | |
| 6 | Cameron Park Zoo | 🇺🇸 United States | |
| 7 | Chapultepec Zoo | 🇲🇽 Mexico | |
| 8 | Reptile Gardens | 🇺🇸 United States | |
| 9 | Parque museo La Venta | 🇲🇽 Mexico | |
| 10 | Siam Serpentarium | 🇹🇭 Thailand |
With luck
About 10% of wildlife watchers report a Mohave Rattlesnake sighting in Saguaro National Park on a given day, based on 135 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 31st most-seen of the 51 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
August and September
In those months about 20% of wildlife watchers report a Mohave Rattlesnake in Saguaro National Park on a given day, against under 5% in June and November–February, the lowest months. Those are among Saguaro National Park's wettest months, with about 45 mm of rain a month against almost none in May.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Mohave Rattlesnake sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 3 parks where we can rate Mohave Rattlesnake sightings, Saguaro National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Big Bend National Park (United States, about 10%).
Same genus: Crotalus
The closest relatives of the Mohave Rattlesnake that you can see in Saguaro National Park (genus Crotalus, Rattlesnakes) are Western Diamondback Rattlesnake (about 40%), Western Black-tailed Rattlesnake (about 20%) and Tiger Rattlesnake (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Mohave Rattlesnake is recorded against all the reptiles logged in Saguaro National Park (135 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.
