20 



BIRD FRIENDS 



been observed especially among meadowlarks, but 

 also among chickadees, chewinks, song sparrows, 

 and field sparrows. These duets are usually sung 

 between birds of the same species, but occasionally 

 are heard between birds of different species. The 

 following records of duets are given by Mr. Oldys: — 



= 112. 



g 



i££ 



2- 



EEEE 



u U U ±J= 



-J i^ I ■ — J- 



m 



Motto accelerando. 



ut s^slslslslstst 



1 



EE 



■J Lj 



DUET OF TWO YIELD SPAEEOWS 



= 192. 



I 



B^ 



EiSBE^ 



l ^Zgizu^ 



Chewinfi 



J = 69. 



M 



■#- a 



S 



fnr^^ 



Bewick's Wren 

 DUET OF CHEWINK AND BEWICK'S WEEN 



Bird trios. Mr. Oldys also records a very unusual 

 case of three meadowlarks singing a trio. Two larks 

 were first singing unrelated phrases. One bird then 

 changed its song to make it respond to that of the 

 other, and after this was repeated several times, a 

 third meadowlark cut in with a phrase related to 



