Assertion: killer whale's life | /r/HasProperty | natural
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Source sentences:
text: Killer whales are also one of the small number of species—along with human beings (Homo sapiens), short-finned pilot whales (Globicephala macrorhynchus), false killer whales (Pseudorca crassidens), belugas (Delphinapterus leucas), and narwhals (Monodon monoceros)—that experience menopause (that is, the stoppage of ovulation prior to the end of their natural lives).