Narwhal (one horn) - Narwhal (English spelling)

Japanese: イッカク(一角) - イッカク（英語表記）narwhal

A mammal of the family Narwhalidae (illustration). A small toothed whale that lives in the Arctic, males have a tusk on their upper left jaw that can reach 2 meters in length. The name "narwhal" comes from this, and the tusk that was brought to Europe was thought to be the horn of a fictional animal called a unicorn. Narwhals live in the Arctic, but are more common from Canada to northern Europe. Body length excluding tusks is 3.8 meters (females) to 4.5 meters (males). They have no dorsal fin. Juveniles are all gray-black, while adults have a black-brown back and a mostly white underside, with the border between the two forming leopard-like markings.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ハクジラ亜目イッカク科の哺乳類（イラスト）。北極圏にすむ小型のハクジラで，雄は左上あごに長さ2mに達するきばをもつ。イッカクの名はこれに由来し，ヨーロッパにもたらされたそのきばは想像上の動物であるユニコーンunicorn(一角獣)の角と考えられた。北極圏に生息するが，カナダからヨーロッパの北部に多い。きばを除いた体長は3.8(雌)～4.5m(雄)。背びれはない。体色は幼体では全身灰黒色，成体では背面黒褐色，腹面はほとんど白色となり，その境はヒョウのような斑紋をなす。

出典　株式会社平凡社世界大百科事典第２版について　情報

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