Assertion: cetacean | /r/HasProperty | porpoise
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Source sentences:
text: As a whole orca make up one of around 90 known species of cetacea (cetaceans include whales, dolphins and porpoises) and are one of the only cetaceans (aside from the false killer whale) known to hunt other marine mammals.
text: Cetaceans include whales, porpoises, and dolphins, and while all are broadly considered intelligent,[How to reference and link to summary or text] dolphins have generated the most attention as their capabilities appear to be of a different order than that of their relatives, who, it should be noted, are much less observed, and thus, more difficult to study.
text: Cetaceans include whales, porpoises and dolphins.
text: The killer whale is one of the only cetaceans (cetaceans include whales, dolphins and porpoises) known to hunt other marine mammals.