Crotalus pyrrhus
Silhouette: Bill Bouton (source photo) & T. Michael Keesey (vectorization) · PhyloPic
In 3 days ~30% in a week ~50%
Common names: southwestern speckled rattlesnake, Mitchell's rattlesnake, more. Crotalus pyrrhus is a venomous pitviper species found in the southwestern United States and northwestern Mexico. A medium-sized snake, it is found mostly in rocky country, active at night and feeding on small mammals. The coloration is variable and depends on the color of the rocks and soil of the habitat.
Adults grow to an average length of 3 feet (91 cm), but may sometimes exceed 4 feet (120 cm). The color pattern is variable, depending on the color of the rocks and soil of the habitat. The snake's ground color may be pink, brown, gray, yellow or nearly white, and speckled with black and white. The pattern (if present) may consist of rhombs, bands or blotches. The tail is ringed.
Southwestern speckled rattlesnake, bleached rattlesnake, Mitchell's rattlesnake, pale rattler, pallid rattlesnake, red rattlesnake, speckled rattlesnake, white rattlesnake. The species may also be referred to colloquially by locality phenotypic traits and an abbreviation of "speckled", to "speck" by snake enthusiasts and in the venomous snake commercial trade. Common versions include blue speck... Wikipedia →
Recording0:03
United States · 2025
© mattstragalus · iNaturalist · CC BY-NC 4.0
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United States · 2020
© BJ Stacey · iNaturalist · CC BY-NC 4.0
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United States · 2022
© jalopy · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Joshua Tree National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | San Diego Zoo | 🇺🇸 United States | |
| 2 | Denver Zoo | 🇺🇸 United States | |
| 3 | Skansen | 🇸🇪 Sweden | |
| 4 | North Carolina Zoo | 🇺🇸 United States | |
| 5 | Zoo Pilsen | 🇨🇿 Czechia | |
| 6 | Living Desert Zoo and Gardens | 🇺🇸 United States | |
| 7 | Bronx Zoo | 🇺🇸 United States | |
| 8 | Los Angeles Zoo | 🇺🇸 United States | |
| 9 | Phoenix Zoo | 🇺🇸 United States | |
| 10 | Dickerson Park Zoo | 🇺🇸 United States | |
| 11 | Fort Worth Zoo | 🇺🇸 United States | |
| 12 | Virginia Zoological Park | 🇺🇸 United States | |
| 13 | Houston Zoo | 🇺🇸 United States | |
| 14 | Arizona-Sonora Desert Museum | 🇺🇸 United States | |
| 15 | San Antonio Zoo | 🇺🇸 United States | |
| 16 | Philadelphia Zoo | 🇺🇸 United States | |
| 17 | Faunia | 🇪🇸 Spain | |
| 18 | Reptile Gardens | 🇺🇸 United States | |
| 19 | Orange County Zoo | 🇺🇸 United States | |
| 20 | Baltic Sea Science Center | 🇸🇪 Sweden |
With luck
About 10% of wildlife watchers report a Southwestern Speckled Rattlesnake sighting in Mesa on a given day, based on 30 verified sightings from GBIF citizen-science data. It is the 10th most-seen of the 24 reptiles we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
May–June and August–September
In those months about 20% of wildlife watchers report a Southwestern Speckled Rattlesnake in Mesa on a given day, against under 5% in November to February, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Southwestern Speckled Rattlesnake sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Yes
Of the 2 cities where we can rate Southwestern Speckled Rattlesnake sightings, Mesa has the highest daily chance: about 10%. Next come Phoenix (United States, about 10%).
Same genus: Crotalus
The closest relatives of the Southwestern Speckled Rattlesnake that you can see in Mesa (genus Crotalus, Rattlesnakes) are Western Diamondback Rattlesnake (about 10%) and Western Black-tailed Rattlesnake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Southwestern Speckled Rattlesnake is recorded against all the reptiles logged in Mesa (30 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.
