View your list of saved words. (You can log in using Facebook.)
Any species of viper (subfamily Crotalinae) that has, in addition to two movable fangs, a heat-sensitive pit organ between each eye and nostril which together help it accurately aim its strike at its warm-blooded prey. Pit vipers are found from deserts to rain forests, primarily in the New World. They may be terrestrial, arboreal, or aquatic. Some species lay eggs; others produce live young. See alsobushmaster, copperhead, fer-de-lance, moccasin, rattlesnake.
This entry comes from Encyclopædia Britannica Concise. For the full entry on pit viper, visit Britannica.com.