Keywords The Lesser Khingan Mountains;Hooded Crane;Breeding Habit;Behavior Coding;Behavior Rhythm;Aerial Survey;Population of Breeding Area;Nest-site Selection;

• 小兴安岭;白头鹤;繁殖习性;行为谱;行为节律;航空调查;繁殖地种群数量;巢址选择;