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precocial adj.【動物;動物學】孤生的〔新孵出來的小鳥即長了羽毛...

precocious

The incubation period lasts 18 - 21 days . the young are precocial , and after being hatched they leave the nest with their parents within 12 hours 雙親輪流孵化,孵化期為18 ~ 21d 。雛鳥為早成鳥,出殼后12h內即隨親鳥離巢。