precocial

Japanese: precocial
precocial

…In the latter case, the eggs are smaller, making it easier for the mother bird to fly. The former is seen in chickens and ducks, whose chicks are called precocial or nidifugous; the latter is seen in sparrows and swallows, whose chicks are called altricial or nidicolous.

*Some terminology explanations that mention "precocial" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…後の場合には卵が小さくなるから母鳥の飛翔はそのぶんだけ楽になる。前者はニワトリやカモに見られるもので,その雛を早成性precocial,または離巣性nidifugousであるという。後者はスズメやツバメに見られるもので,その雛を晩成性altricial,または留巣性nidicolousであるという。…

※「precocial」について言及している用語解説の一部を掲載しています。

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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