Assertion: humpback whale's fin | /r/HasProperty | huge pectoral
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Source sentences:
text: Breaching usually begins with two or three beats of the tail before the humpback leaps out of the water, rolls in the air with its huge pectoral fins outstretched like wings and finally crashing back into the ocean, creating a spectacular splash.
text: Humpbacks will leap out of the water, roll in the air with their huge pectoral fins outstretched like wings, and crash noisily back into the water.