| americas | 0.25 |
| wide array of habitats | 0.16 |
| bite | 0.61 |
| shed their skin | 0.49 |
| inject venom | 0.46 |
| emerge in march | 0.46 |
| eat mouse | 0.44 |
| control the amount of v… | 0.43 |
| mate in the spring | 0.43 |
| bear young | 0.41 |
| feed on small mammals | 0.41 |
| avoid human | 0.40 |
| More » |
| rattle | 0.69 |
| triangular head | 0.43 |
| eyelid | 0.25 |
| pit vipers | 0.42 |
| handled | 0.49 |
| used in conjunction | 0.35 |
| captured | 0.30 |
| removed | 0.28 |
| encountered | 0.25 |
| released | 0.25 |
| killed | 0.16 |
| resistance | 0.30 |