Assertion: ostrich's sternum | /r/HasProperty | breastbone
Facets:
Source sentences:
text: Since ostriches do not possess a keeled sternum i.e. a breastbone, which is common in most flying birds, they lack the ability to fly.
text: The Ostrich is unable to fly and does not have a keeled sternum (breastbone) common to most birds.
text: It is unable to fly and does not posses a keeled sternum (breastbone) common to most birds.