Assertion: viper | /r/HasAspect | triangular-shaped head
Facets:
value: due to the venom glands
type: CAUSE
Source sentences:
text: The viper's venom-producing glands are toward the back of the upper jaw, causing the viper to have a triangular-shaped head, distinguishable from the neck.
text: Due to the venom glands, vipers have a triangular shaped head that is distinct from the neck.
text: Vipers have a triangular-shaped head.