Plate XXXII. The Cowbird and the Prairie Horned Lark of Nest No. 
20, Evanston, II. 
Fig. 1. Cowbird, first day, (left); Lark, second day, June 9, 1926. 
Fig. 2. Lark, third day, (left); Cowbird, second day, June 10, 
1926. 
Fig. 3. Lark, eighth day, (left); Cowbird, seventh day, June 15, 
1926. 
Fig. 4. Cowbird, ninth day, (left); Lark, tenth day, June 17, 1926. 
Fig. 5. Lark (left), and Cowbird in nest the day prior to nest- 
leaving, June 17, 1926. Note the advanced plumage of the 
Lark as compared with the Cowbird. 
