150 



Wild Birds 



form, when as yet there were no plastic materials to be shaped. 

 With such molding movements one might compare the preen- 



Fig. 95. Female Robin brooding: ache 

 to any unusual sound. 



ing actions of nestlings, which begin before there are any feathers 

 to preen. 



From one to seven minutes was commonly spent in this 

 round of actions. Only a subdued cut-cut ! was occasionally 



