Assertion: narwhal | /r/CapableOf | live on diet
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Source sentences:
text: Narwhals live on a diet that primarily consists of eight food sources: squid, rockfish, Greenland halibut, shrimp, crab, polar cod, flounder and Arctic cod” (http://www.oceanwide-expeditions.com/blog/article/the-narwhal-so-much-more-than-just-a-wacky-viral-video#sthash.eOQACqur.dpuf).