Assertion: narwhal | /r/HasProperty | marine mammal
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Source sentences:
text: 8) Because the narwhal is a marine mammal it is warm-blooded, produces milk, gives birth to its young and breathes air.
text: It is a marine animal that is nicknamed the unicorn of the sea.
text: Since narwhals are marine mammals, they have lungs and they breathe air.
text: Research by the University of Washington and the University of Alaska Fairbanks found narwhals are the marine mammal least likely to survive the loss of ice floes.