Assertion: water moccasin | /r/HasProperty | pit vipers
Facets:
Source sentences:
text: Cottonmouths, like North America’s copperheads and rattlesnakes, are pit vipers.
text: Water moccasins are a ‘pit viper.
text: Copperheads, cottonmouths and rattlesnakes are called pit-vipers because they have a pit near each nostril which is highly sensitive to heat.