PLATE V. 



Cow Skill occupied as Nesting Box by Wrens. 

 Birds are not very particular about the size or shape of their nesting cavities. Twenty-four 

 skulls were hung up on trees at Wallop's Island, Virginia, and 23 were occupied immedi- 

 ately by wrens. (From photograph by Charles P. Shoflner, Secretarj-, Liberty Bell Bird 

 Club. Philadelphia. See page 119.) 



