Plate XXXIII. Concealing Coloration of Prairie Horned Lark Nest- 
lings. 
Fig. 1. The blending of natal down with nest surroundings (nest 
No. 13, May 7, 1926, Evanston, IIl.). 
Fig. 2. “Picture pattern” of light and dense shadows of the 
ground in the juvenile plumage of young near nest-leaving 
(nest No. 4, May 3, 1926, Evanston, II1.). 
