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 im 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, 
