Assertion: humpback whale's baby | /r/HasProperty | calf
Facets:
Source sentences:
text: Pregnancy lasts 10 to 11 months and ends with one baby (calf).
text: Babies, called calves, are born live, like most mammals.
text: Female Killer whales give birth to a single baby (calf) every 3 to 10 years after 17 months of pregnancy.
text: The whale babies are called calves and generally only one calf at a time is born, although exceptions do happen from time to time.