Plate 
No. 
THE BIRD-LIFE OF A YEAR, 
April 20 to 80. 
. Spotted Sandpiper. 
. Semipalmated Sandpiper.* 
. Whip-poor-will. 
. Chimney Swift. 
Least Flycatcher. 
. Towhee. 
Blue-headed Vireo. 
. Purple Martin. 
1. Cliff Swallow, 
. Bank Swallow. 
Rough-winged Swallow. 
60. Black and White Warbler. 
61. Black-throated Green 
Warbler. 
67. Brown Thrasher. 
Birps Nestine. 
(In addition to the species which began to nest in March, all of 
which will have eggs or young in April, the following may be 
found nesting) : 
April 1 to 15. 
. Woodcock. 
. Red-shouldered Hawk. 
. Screech Owl. 
Red-tailed Hawk. 
. American Crow. 
Long-eared Owl. 
. Bluebird. 
Plate 
No. A 
April 15 to 30. 
71. White-breasted Nut- 
hatch, aes 
89. Robin. 
18. Mourning Dove. 
37, 91. Purple Grackle. 
82. Phoebe. 
41. Song Sparrow. 
May. 
As the season advances, marked changes in tem- 
perature are less likely to occur, and the migration 
becomes more regular and continuous... In Febru- 
ary and March there may be two weeks or more 
variation in the times of arrival of the same species 
in different years ; in May we can expect to find a 
given species within a day or two of a certain date. 
Nevertheless, we shall find the force of the migra- 
tory current still closely dependent on meteorologic 
* Transient Visitant passing further north. 
