36 DUCK DOLLARS 
Drake, Showing Curl Feather 
This photograph of a drake shows the curl eather in the tail which is first seen 
at puberty and is the mark of the sex. The ducks do not have it. Sometimes a 
drake will be found without this curl feather, which may have been lost in molting, 
or have been pulled out. In examining a lot of birds, the quickest way to tell the 
sex is to pick them up one by one by the neck and listen to the noise or note 
which each makes. 
