Plate XXVI. Nestling Prairie Horned Larks of Nest No. 7—continued. 
Fig. 1. Young responding to whistle, May 1, 1926. All still re- 
spond, though the eyes of the older are opening, 
Fig. 2. Two young sixth day, two young fifth day, May 1, 1926. 
The discrepancy in size between the older and younger nestlings 
is here very noticeable, much more than the growth of one day 
(the difference in age), would account for if all had received the 
same amount of food, 
