Because many spring birds are in their breeding plumage, it can be easier to identify them based on colors and feather patterns.
因为很多鸟在春天都换上了繁殖羽，根据颜色和羽毛图案来识别鸟种将变得更容易。
Because many spring birds are in their breeding plumage, it can be easier to identify them based on colors and feather patterns.
因为很多鸟在春天都换上了繁殖羽，根据颜色和羽毛图案来识别鸟种将变得更容易。
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