precocial

形容词 precocial:

1. (of hatchlings) covered with down and having eyes open; capable of leaving the nest within a few days

pre.co.cial

adj.（形容词）
Covered with down and capable of moving about when hatched. Used of wading birds and domestic fowl.
早成性的：刚孵出便覆有绒毛并能行走的。用于涉禽和家禽

来源：
From New Latin Praecocôs [precocial birds]
源自 现代拉丁语 Praecocôs [出生便能独立活动的鸟]
from Latin [pl. of] praecox [premature] * see precocious
源自 拉丁语 [] praecox的复数 [早熟的] *参见 precocious