VOICE OF BIRDS. (53 



is a most welc(^me promise of spriuii:. Then follow tlie 

 Rubins, I]lac'kl)ircls, and other migrants, until, late in 

 ^lay, the great springtime chorus is at its height. 



The Bobolink is the first bird to desert the choir. 

 AVe do not often hear him after July 5. Soon he is fol- 

 lowed by the A'eery, and each day now shows some fresh 

 vacancy in the ranks of the feathered singers, until by 

 Auo^ust 5 we have left onlv the AVuod Pewee, Indiiro 

 Bunting, and Hed-eyed Vireo — tireless songsters who 

 fear neither midsunnner nor midday heat. 



CaU-Xutes. — The call-notes of birds are even more 

 wortliy of our attention than are their songs. Song is 

 the outburst of a special emotion ; call-notes form the 

 language of every day. Many of us are familiar with 

 birds' songs, but who knows their every call-note and 

 who can tell us what each call means ? For they have a 

 meaning that close observation often makes intelligible. 



Listen to the calls of the Robin and learn how unmis- 

 takably he expresses suspicion, alarm, or extreme fear ; 

 how he signals cheerfully to his companions or gives the 

 word to take wing. Study the calls of the Crow or Blue 

 Jay, and you will find that they have an apparently ex- 

 haustless vocabulary. 



It is supposed that birds, like men, do not inherit 

 their language, but acquire it. Thus there are recorded 

 instmces of young birds who had been isolated from 

 others of their kind, learning to sing whatever song they 

 heard. On the other hand, it is said that a bird iidierits 

 its own notes, at least to some extent, and, while it may 

 not sing the song of its species perfectly, its song will 

 still be sufiiciently characteristic to be recognizable. 

 There are, however, very few satisfactory observations 

 on this subject, and keepers of cage-birds have here an 

 excellent opportunity for original investigation. 



