Class I Downy, no feathers visible 



1A 



IB 



IC 



Body roundedrneck 

 and Tail not prominent. 

 Age: 1-4 days 



Down color fading. 

 Age: 5-8 days 



Neck and tail 

 prominent. Gawky. 

 Age: 9-14 days. 



Class II Partly feathered 



IIA 



First feathers. Less than 

 1/2 of side feathered. 

 Age: 15-25 days 



1/2 or more of side feathered 

 Down on nape, back, or upper rump. 

 Age: 25-35 days 



Class III Fully feathered, flightless 



Age: 36-51 days 



a 



Down 



Y/\ Feathers 



Appendix E, Fig. 1. Guide to aging harlequin ducklings in the field (Cassirer and Groves 1994, 

 from diagram in Dimmick and Pelton 1994:173, after Gollop and Marshall 1954). 



50 



