58 BIRDS THROUGH AN OPERA-GLASS. 



far over river and lake, calling loudly to the 

 echoes as he goes. 



He is the most marked of the trillers, having a 

 loud, rapid call that Wilson compares to a watch- 

 man's rattle, and that, as Mr. Burroughs ingen- 



iously suggests, reminds you of an alarm clock. He 

 usually gives it when on the wing, and if on hear- 

 ing him you look up in time, you will see a large, 

 ungainly slate-blue bird, with an odd flight his 

 short tail making him out of proportion so that his 

 wings seem too far back. As he flies over, you 

 note his big, heavily-crested head, his dark collar, 



