altricial birds.
晚成雏的鸟
altricial birds.
晚成雏的鸟
The chickens were altricial and the parental care period lasted for 40~50 days, including three stages.
雏鸟为晚成鸟,育雏期40~50天左右,育雏过程分育雏初期、中期、末期三阶段;
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