Select the snake family or subfamily and your current world region. If you don't know the family/subfamily, go to the "Find terrestrial snake by morphology (general)" page and follow the instructions.
Find terrestrial venomous snake by morphology (regional)
Selection
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Morphological identification key
| Crotalinae |
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Is there a "rattle" or a knob-like projection on the end of the tail? |
yes |
Are there several enlarged shields on the top of the head (generally 9, sometimes 11)? |
yes |
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| no | no | |||||
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Crotalus sp. (excluding Crotalus ravus) |
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Are there several enlarged shields on the top of the head (generally 9)?
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yes |
Agkistrodon sp. | ||||