Assertion: elephant's calf | /r/HasProperty | born at time
Facets:
Source sentences:
text: more than one calf to be born at a time, and this newborn calf can immediately stand up under his or her own power and walk a few faltering steps on its not so little feet.
text: Since calves require much care as they develop, only one calf is born at a time and females only give birth about once every 3 or 4 years.