Life Histories of Various Species 
205 
Yellow Warbler (Dcndroica aestiva aestiva) 
During the spring of 1915, while attempting to secure photo- 
graphs of birds for school work 1 had my blind at two yellow 
warbler nests without succeeding in getting any very good nega- 
tives. The color of the birds seemed to be the great drawback 
to securing good results, as in most negatives they appeared prac- 
tically indistinguishable from the dark green background of the 
leaves. I did, however, succeed in securing a few notes on their 
behavior at the nest. 
Nest No. 1 was discovered on June Id and contained at this 
time four eggs. The nest was located in one of a row of goose- 
berry bushes and was approximately two feet from the ground. 
June 20 the eggs were hatching and on June 21 the blind was 
erected, observations starting at 9 :00 a. m. on the morning of June 
22. This nest was watched for two hours on June 22 and one hour 
on June 24. When I returned to the blind on June 28 the young- 
had disappeared. During these three hours the male fed the 
young ten times, the female came fourteen times, and four times 
while I was busy with the camera I failed to note the sex of the 
parent or material fed. Both parents were nervous, active little 
folks and except for their fortunate habit of carrying things in 
the tip of the bill I would have been at a loss to learn anything 
of the material fed. When feeding the small green larva, so com- 
mon at this season of the year, they carried many of them by one 
end, the other end dangling loose. Apparently nothing else was 
carried at these times as I could see through the parted mandi- 
bles behind the larva. On one visit the male came with seven of 
these larvce hanging from his beak. He tried to ram them all 
down the throat of one nestling at one time but failed in this 
and had to give them in three instalments. Usually the larvae 
were picked from the bushes in the immediate vicinity of the 
nest and brought in one or two at a trip. Forty-six recognized 
objects were fed in 28 visits, including 20 green larva, 3 winged 
insects, 2 spiders, and 11 or more small, much crushed objects 
which I could not recognize at all. 
Several times the male gave the worms he brought to the 
female who in turn fed them to a nestling. The male was much 
the more timid of the two in this pair of birds. He made seven 
attempts to approach the nest on his first visit on the morning 
of June 24, while the female sat on the nest brooding. On such 
an occasion the female awaited the approach of the male with 
the food with open mouth and quivering wings. Her behavior 
