186 The Wilson Bulletin— No. 97 



July 29, 2:00-4:00 P. M. 

 The day was very warm, a maximum of 100 degrees oc- 

 curring at 2 P. M. The young birds were quiet in the nest. 

 They seemed completely feathered and almost full grown. 

 Their tail feathers measured fully two inches. At 2 :15 the 

 nestlings opened their mouths and kept them open, but this 

 seemed more on account of the heat than because of hunger. 

 Ten minutes later a parent brought some berries, the little 

 ones chirping vigorously. It flew away again in half a sec- 

 ond. The nestlings chirped after the bird left. At 3 :08, as 

 a parent approached, each 3^oung bird opened its mouth and 

 answered the parent's call. In five seconds each was fed and 

 the parent left. At 3 :25 all the young were fed with amel- 

 anchier berries. After the parent left they again kept their 

 mouths open, because of the heat. Five minutes later one 

 nestling became restless and chirped several times. 



July 30, 9:30-11:00 A. M., 4:00-6:00 P. M. 



This was the warmest day during my observing, the ther- 

 mometer registering 102 degrees. At 9 :45 I found the nest- 

 lings with mouths open, lying still. Five minutes later a 

 parent came with berries and the young were fed very 

 quickly, for the parent flew away again in less than a half 

 minute. The little ones chirped and two stood up as if they 

 would like to go after it. The birds were restless for the 

 next three minutes, opening their mouths and uttering a loud 

 chirp. The inside of their mouths was not so brightly col- 

 ored as a few days before. At ten o'clock a parent brought 

 blue berries and in its eagerness to get its share one nestling 

 lost its balance and fell back into the nest. The parent left at 

 10 :03 and two minutes later the little birds stood up and 

 moved their wings with their bills wide open, but no parent 

 appeared. At 10 :10 the largest of the young held its head 

 and wings stretched clear out of the nest. Five minutes later 

 the parent brought an insect which the young eagerly de- 

 voured and half a minute later the old bird left. In the next 



