EARLY SPRING BIRDS 



tude. Migrants arrive near Washington a week or two 

 earlier than near New York City, and near Boston a few 

 days later. The lateness of the spring sometimes causes 

 a delay of a week or two. The May arrivals appear more 

 nearly on schedule. After May 15 birds begin to de- 

 crease in number, the "Transient Visitors" passing farther 

 north; by June 5 we have with us our "Permanent Resi- 

 dents" and "Summer Residents." 



In the fall the mildness of a season may cause Novem- 

 ber migrants to remain into December, or an open winter 

 may tempt those that habitually migrate only a short dis- 

 tance to remain north of their usual winter range. 



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