Assertion: copperhead's head | /r/HasAspect | their own esophagus
Facets:
value: in most cases
type: TEMPORAL
Source sentences:
text: In most cases, both heads have their own esophagus and trachea, and often their own heart and set of lungs, but snakes with one head and two jaws, as well as those with two heads and one jaw, have also been reported.