Reliability of Determining Adults from Juvenile Ducks by Presence or Absence of Notched Tail Feathers in Various Species of North American Ducks

Frank Rohwer استاد راهنما , Andy Nyman استاد مشاور , Robert Cox استاد مشاور

Aythya affinis , lesser scaup , Anas strepera , gadwall , redhead , Anas americana , tail molt , age determination , mallard , Anas platyrhynchos , northern pintail , Anas acuta , morphometric measures