| Queretaran Dusky Rattlesnake |
| This species of rattlesnake is very similar to crotalus triseiatus but its distribution is in the north of the municipality. It is a snake with a lenght of 90 cm and clear gray color until dark gray. Neonates has the eyes bulging. It has circular spots in the back and a thin rattle. Its is dangerous by to be common and because that the antivenom does not exist in this area |
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| (Crotalus aquilus) |
| Family Viperidae |
| Rare |
| Long: 0.6 a 0.9 m |
| Diet: Roedents |
| Activity: Diurnal |