Assertion: pit viper's pit | /r/HasProperty | essential
Facets:
value: for the survival of this species
type: PURPOSE
Source sentences:
text: These pits are essential for the survival of this species as they serve as infrared sensors allowing the snake to locate its prey; even predators at times.
text: These pits are essential for the survival of this species as they serve as infrared sensors allowing the snake to locate its prey; even predators at times.