Webbed feet - Mizukaki (English spelling) web

Japanese: 水かき(蹼) - みずかき(英語表記)web
Webbed feet - Mizukaki (English spelling) web
A thin membrane of skin between the toes of aquatic animals. It is found in frogs, waterfowl, otters, and some mammals, and helps them paddle when swimming or diving. Depending on the degree of development of the webbing, birds' toes are classified as totipalmate (all four toes are webbed; only in Pelicans), palmate (the front three toes are webbed; ducks, gulls, shearwaters, etc.), or semipalmate (there is a small web between the base of the toes).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
水生動物の指と指の間にあるうすい皮膚の膜。カエルや水鳥,カワウソなど一部の哺乳類などにあって,遊泳や潜水の際に水をかくのに役だつ。鳥類の足指は,水かきの発達の程度によって,全蹼足(ぜんぼくそく)totipalmate(4本の指が全部水かきでつながる。ペリカン目のみ),蹼足palmate(前3本の指が水かきでつながる。カモ,カモメ,ミズナギドリなど),半蹼足semipalmate(指のつけ根の間に小さな水かきがある。

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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