ioo THE BIRDS OF SOMERSET HILLS 



be told from the two others by keenly 

 observant bird students, not beginners. 

 The last two can be told apart in life 

 only by the most expert field ornitholo- 

 gists. The differences between the three 

 kinds are as follows : The cheeks of the 

 Olive-backed Thrush are buffy, while 

 those of the other two are grayish. The 

 Gray-cheeked and Bicknell Thrushes 

 differ in the latter being slightly 

 smaller and brighter. The song of the 

 Olive-backed Thrush starts high and 

 each note becomes lower and lower- 

 The song of the Bicknell Thrush is very 

 much like that of the Veery, but that 

 of the Gray-cheeked is, I believe, un- 

 known. The Olive-backed and Bicknell 

 Thrushes nest in our Northern states, but 

 the Gray-cheeked breeds much farther 

 north. However, they are all only mi- 

 grants in the Somerset Hills. 



