Assertion: humpback whale's head | /r/Synonym | tubercle
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Source sentences:
text: They are easily recognizable by their long flippers (up to 1/3 the length of their entire bodies), their large, black-and-white tail flukes, and the series of bumps on their heads, known as tubercles (see the Cetacean Sightings Network website for further information on recognizing Humpback Whales).