Assertion: narwhal's tusk | /r/HasProperty | the narwhal
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Source sentences:
text: Physical Characteristics One of the most fascinating and unusual creatures of the whale family is the arctic-dwelling whale with a tusk, the narwhal.
text: Chris and Martin are arguing with each other about which is better, horns or antlers, when they get a call from Wild Kratts Kid Nua about a whale with a unique horn-like tusk: the narwhal.