genus
Rattlesnakes
Crotalus
Field notes
Crotalus is a genus of pit vipers, commonly known as rattlesnakes or rattlers, in the family Viperidae. The genus is found only in the Americas from southern Canada to northern Argentina. The generic name Crotalus is derived from the Greek word κρόταλον krótalοn, which means "rattle" or "castanet", and refers to the rattle on the end of the tail, which makes this group (genera Crotalus and Sistrurus) so distinctive. As of July 2023, 44 to 53 species are recognized as valid.
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- Western Rattlesnake native
- Western Diamond-backed Rattlesnake native
- Timber Rattlesnake native
- Prairie Rattlesnake native
- Western Black-tailed Rattlesnake native
- Mojave Rattlesnake native
- Red Diamond Rattlesnake native
- Sidewinder native
- Eastern Diamondback Rattlesnake native
- Southwestern Speckled Rattlesnake native
- Rock Rattlesnake native
- Eastern Black-tailed Rattlesnake native
- Neotropical Rattlesnake
- Dusky Rattlesnake
- Tiger Rattlesnake native
- Arizona Black Rattlesnake native
- Panamint Rattlesnake native
- Basilisk Rattlesnake
- Queretaran Dusky Rattlesnake
- Ridge-nosed Rattlesnake native
- Yucatán Neotropical Rattlesnake
- Twin-spotted Rattlesnake native
- Northwestern Neotropical Rattlesnake
- Speckled Rattlesnake
Range
Greener is more native, amber more introduced; paler is less certain. How this was decided
Most observed native rattlesnakes All
Native to the US, by observations.
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Western Rattlesnake
Crotalus oreganus
38,608 observations
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Western Diamond-backed Rattlesnake
Crotalus atrox
31,586 observations
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Timber Rattlesnake
Crotalus horridus
15,672 observations
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Prairie Rattlesnake
Crotalus viridis
10,041 observations
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Western Black-tailed Rattlesnake
Crotalus molossus
6,318 observations
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Mojave Rattlesnake
Crotalus scutulatus
6,232 observations
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Red Diamond Rattlesnake
Crotalus ruber
6,148 observations
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Sidewinder
Crotalus cerastes
5,131 observations
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Eastern Diamondback Rattlesnake
Crotalus adamanteus
4,556 observations
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Southwestern Speckled Rattlesnake
Crotalus pyrrhus
4,518 observations
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Rock Rattlesnake
Crotalus lepidus
2,668 observations
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Eastern Black-tailed Rattlesnake
Crotalus ornatus
2,315 observations
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Tiger Rattlesnake
Crotalus tigris
1,230 observations
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Arizona Black Rattlesnake
Crotalus cerberus
859 observations
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Panamint Rattlesnake
Crotalus stephensi
821 observations