THE BIRDS' TIME-TABLE 



do you think it has passed the winter? At about 

 what date does the Robin arrive? Does it come 

 alone or with others? When does it become com- 

 mon? Do th,e first arrivals sing? Why should birds 

 arrive with more regularity in May than in March? 

 How does weather affect the migration of birds? 

 Are birds good weather prophets? Where do most 

 of the first arrivals come from? Where have many 

 of the last arrivals spent the winter? Trace on 

 the map the region occupied by the army of march- 

 ing birds when the first ranks are passing the lati- 

 tude of New York City. Mention some of the bird 

 travelers of March; of April; of May. When 

 do the Warblers come? When is the spring mi- 

 gration finished? What name is applied to those 

 migrants which pass us to nest further north? To 

 those which remain to nest with us? When does 

 the fall migration begin? When is it concluded? 



