Assertion: boa constrictor | /r/HasAspect | two lungs
Facets:
value: unlike many colubrid snakes
type: OTHER
Source sentences:
text: Boa constrictors also have two lungs, a smaller (non-functional) left and an enlarged (functional) right lung to better fit their elongated shape, unlike many colubrid snakes, which have completely lost the left lung.
text: Boa constrictors are a "primitive snake" which means they have two lungs instead of one and their skeletons still have a vestigial set of back legs and pelvic bones.