BIRD PHOTOGRAPHY BEGINS AT HOME 41 
plished singers. In addition to the insistent, reiter- 
ated chissick, chissick, which constitutes the song of 
the male, one soon learns to recognize calls of warn- 
ing, alarm, flight, battle, and the soft whistle which 
the bird utters when it approaches its nest—the only 
musical note in its vocabulary. 
Quick to noti¢e the slightest deviation from nor- 
mal conditions, House Sparrows are difficult birds 
20. House Sparrows and Junco, 
to photograph. They seem to be constantly on the 
watch for some sign of danger, and an unusual ar- 
rangement of blind or shade at once arouses their 
suspicions. After a heavy fall of snow, however, 
hunger dulls the edge of their fears, and by scatter- 
ing food near a suitable window the birds may be 
decoyed within photographing distance.” It will be 
found necessary, even then, to conceal the camera, 
