Assertion: humpback whale's fin | /r/HasProperty | arm
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Source sentences:
text: The Humpback Whale, as its name suggests, has a humped back, although its most distinctive features are its knobbly head and its long pectoral fins (the whale’s ‘arms’).
text: Unlike their ‘cousins’ the blue, sei and minke whales, humpbacks (Megaptera novaeangliae) are not slender and graceful — they tend to be quite stout and stocky, with exceedingly long pectoral fins (their ‘arms’).