Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Living Organisms (hierarchy name)
4. living organisms (entities)
5. Eukaryota (domain)
6. Animalia (kingdom)
7. Chordata (phylum)
8. Vertebrata (subphylum)
9. Aves (class)
10. Anseriformes (order)
11. Anatidae (family)

Anotations

Scope note:

General term for members of various species of relatively small, short-necked, large-billed waterfowl. They differ from geese in being smaller in size and having legs that are placed rearward, and the result is a distinctive waddling gait. Males, known as drakes, and females, known as hens, exhibit some degree of differentiation in plumage and in call.