| thailand | | crotalus oreganus helleri | subspecies | 4 | 0 |
| united states | | crotalus cerberus | species | 1 | 0 |
| united states | | crotalus oreganus | species | 1 | 0 |
| united states | california | crotalus oreganus | species | 1 | 2 |
| united states | california | crotalus oreganus helleri | subspecies | 5 | 5 |
| united states | california | crotalus oreganus oreganus | subspecies | 0 | 2 |