Assertion: old world viper | /r/HasProperty | subfamily viperinae
Facets:
Source sentences:
text: Viper, (family Viperidae), any of more than 200 species of venomous snakes belonging to two groups: pit vipers (subfamily Crotalinae) and Old World vipers (subfamily Viperinae), which are considered separate families by some authorities.
text: …pit vipers (subfamily Crotalinae) and Old World vipers (subfamily Viperinae), which are considered separate families by some authorities.