Assertion: elephant's calf | /r/HasProperty | single
Facets:
Source sentences:
text: After mating and a gestation period of up to 2 years, the female African Bush Elephant gives birth to a single calf (twins have been known but are extremely rare).
text: After a gestation period of nearly two years, the female elephant will birth a single calf.
text: After a gestation period of up to 2 years, the female African Forest Elephant gives birth to a single calf (twins have been known but are extremely rare).
text: Female Savannah elephants give birth to a single calf after a gestation period of two years.