precocial animals早熟动物
precocial bird离巢鸟;雏鸟为早成鸟
Precocial and Altricial Species早熟性和晚成性物种
ADJ（形容词） (of the young of some species of birds after hatching) covered with down, having open eyes, and capable of leaving the nest within a few days of hatching (孵化后的一些种类的雏鸟)早成的
N（名词） a precocial bird 早成鸟