Plate XXXI. Growth of the Nestling Prairie Horned Lark (cont.) 
and a Recent Nestling. 
Fig. 1. Two young from the same nest (Cy, May 13, 1927, Ithaca, 
N. Y.) on the eighth day. The difference in their ages is a few 
hours only, but this difference is so vital in the matter of get- 
ting food from the parent that it frequently results in starvation 
of the younger. The smaller is retarded in size, feather growth 
and psychical ibaa Weight of larger 22.6 grams, of the 
smaller 11.5 gr 
g. 2. Young Prairie Horned Lark just after nest-leaving, July 
11, 1926 (nest No. 22, Evanston, IIl1.). 
