相关migratory的文学知识

BirdIslandinQinghaiLakeonthehundredsofthousandsofmigratorybirds.Therewasthemostresidentbirdspecies(67.7%)inautumnandthemostmigratorybirdspecies(57.4%)inspring.It'slikeaherdofhornedhorsesmigratingonth...