U. S. NATIONAL MUSEUM 



BULLETIN 170 PLATE 74 



Middleboro, Mass., May 5, 1907 



A. C. Bent. 



Young in nest, about four weeks old. 



Mount Vernon, Iowa. 



C. R. Keyes. 



Young 41, 43, and 45 days old. 

 Great Horned Owls. 



