Buzz·Posted on Jun 19, 2015How Well Do You Know Narwhals?For all intents and porpoises.by Kasia GalazkaBuzzFeed StaffFacebookPinterestTwitterMailLink Martin Camm/Thinkstock / Kasia Galazka/BuzzFeed Andreas Meyer / Thinkstock Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! The mystical nickname comes from the narwhal's tusk, which resembles a unicorn horn. Paul Nicklen / National Geographic Stock / WWF-Canada Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! Those tusks are actually teeth, and narwhals have two! For males, one is an ivory tusk that comes out of his upper lip. Ladies can also grow them, but they’re a bit daintier in size. Tap to play or pause GIF Tap to play or pause GIF Via charlievdc.tumblr.com Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! Narwhals travel in pods. A covey is typically birds, a cloud usually insects, and a grumble is associated with pugs. Dorling Kindersley / Thinkstock Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! The prefix "Nar" means "corpse," and "hval" means "whale." "Corpse whale" is a reference to their skin color, which resembles a drowned sailor. Tap to play or pause GIF Tap to play or pause GIF Via giphy.com Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! Though they're born blue-gray, narwhals change hues as they get older. Juveniles are blue-black, adults are a marbled gray, and old narwhals are almost completely white. Eric Baccega / WWF-Canon / Via naturepl.com Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! A team of researchers found that narwhal teeth are filled with a pulpy nerve tissue that seems to be sensitive to its surroundings. Paul Nicklen / National Geographic Stock / WWF-Canada Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! With their tusks growing up to nine feet, narwhals are majestically massive and about as big as a bus, according to National Geographic. Staffan Widstrand / WWF Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! Narwhals are hunted for their tusks, but their skin is also an rich source of vitamin C in a traditional Arctic diet. Doug Allan / WWF-Canon / Via naturepl.com Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! During winter, narwhals dive up to a mile up to 25 times a day! The pressure at those depths is intense at 2,200 pounds per square inch, according to the National Oceanic and Atmospheric Administration. But narwhals can shut off oxygen or blood flow to noncritical body parts, and they have a conveniently compressible rib cage. Unlike dolphins, their muscles are built for endurance swimming, which helps conserve energy and, subsequently, oxygen consumption. Answer Image Correct Incorrect Answer Image Correct Incorrect Answer Image Correct Incorrect Correct! Wrong! Because narwhals are so elusive, scientists haven’t been able to conduct much research about their mating habits — and that's lead to a lot of speculation about what those tusks are for, exactly. But a study published in Marine Mammal Science shows male tusks can be linked to the size of their testes, which is an indicator of fertility. So like peacocks, narwhals might rely on their appearance to attract a mate.