照顧期
Mammalian neonates can be divided into three categories, namely precocial, altricial, and immature, mainly according to their establishment of successful thermoregulation. 摘要按照體溫調(diào)節(jié)能力的發(fā)育情況，哺乳動物的生長發(fā)育可分為早成性、晚成性和未成熟性3類。
altricial birds. 晚成雛的鳥
altricial bird 留巢鳥
