ナショナルジオグラフィックのインスタグラム(natgeo) - 5月19日 22時56分

Photograph by @paulnicklen // Meet the mysterious, elusive, shy, rarely seen, intelligent and vulnerable narwhal. A male narwhal rises from the icy seas of Lancaster sound. The most noticeable characteristic of the narwhal is the long tusk, which is a canine tooth that projects from the left side of the upper jaw, through the lip, and forms a left-handed helix spiral. Narwhals actually do not have any teeth inside of their mouths. A tusk grows throughout life, reaching a length of 5 to 10 feet. The one thing you need to remember about narwhal is that they primarily feed on polar cod and the polar cod life cycle is tied to sea ice. Without ice there will be catastrophic effects on all species. Some scientists say that the narwhal are just as vulnerable as the polar bear to climate change. #followme on @paulnicklen to learn and see more about the unicorn of the sea. #bethechange #nature #naturelovers #instagood #arctic #climatechangeisreal

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