Assertion: whale's baby | /r/HasProperty | single
Facets:
Source sentences:
text: Female Killer whales give birth to a single baby (calf) every 3 to 10 years after 17 months of pregnancy.
text: Female killer whales usually give birth to a single baby once every 3 to 5 years.
text: Adult killer whales give birth to a single baby (only once were twins recorded) about every 5 years.