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本文數(shù)據(jù)資料來(lái)源：

? Research Article?The longer the better: evidence that narwhal tusks are sexually selected

? https://asunow.asu.edu/20200317-discoveries-narwhals-unicorn-seas-size-matters-sexual-selection

? https://www.worldwildlife.org/species/narwhal

[1]Nweeia MTet al.2014 Sensory ability in the narwhal tooth organ system. Anat. Rec. 297, 599-617.?

[2]Porsild MP. 1922 Scattered observations on narwhals. J. Mammal. 3, 8-13.

[3] Gerson HB, Hickie JP. 1985 Head scarring on male narwhals (Monodon monoceros): evidence for aggressive tusk use. Can. J. Zool. 63, 2083-2087.?

[4] Silverman HB, Dunbar MJ. 1980 Aggressive tusk use by the narwhal (Monodon monoceros L.). Nature 284, 57-58.?

[5] Hay KA. 1984 The life history of the narwhal (Monodon monoceros L.) in the eastern Canadian Arctic. Montreal, Canada: McGill University.