eared seal; sea lion
Refers to eared seals, especially the California sea lion (Zalophus californianus). Often contrasted with アザラシ (earless seal).
See also: アザラシ
I saw a sea lion show at the aquarium.
You can tell sea lions apart from seals because they have external ear flaps.
アザラシ (earless seal) lacks visible ear flaps and cannot walk on land, while アシカ (sea lion) has ear flaps and can move on its flippers.
Usually written in katakana; the hiragana spelling あしか is also common.
Hiragana spelling; katakana is more common for animal names.
Rarely used kanji form; the reading みち is obsolete.
Rarely used kanji form.
Rarely used kanji form; also read かいば (hippocampus) or うみうま (sea horse).
The word あしか is of uncertain origin. It may be related to 足 (あし, 'foot') and 鹿 (か, 'deer'), but this is speculative. The kanji forms 海驢, 葦鹿, and 海馬 are ateji and rarely used.