duck the common name important number anseriform birds generally migratory belonging anatidae family

navigate by keyword : anatidae anseriform applies belonging birds common contrary defines definition devoid different dimorphism duck family genera general generally goose great groups important marked migratory name number opposed sexual size smaller species subfamilies systematic term value various which

Duck is the common name of an important number of anseriform birds, generally migratory, belonging to the Anatidae family.. It is a definition devoid of systematic value, as it groups species belonging to various different genera and sub-families; in general the term & x22;duck& x22; applies to the smaller Anseriform species with marked sexual dimorphism, as opposed to goose, which on the contrary defines species of great size and without dimorphism