Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by ownership]
8. animal architecture

Anotations

Scope note:

Structures made or places chosen and adapted by a bird, insect, or other animal in which to lay and incubate its eggs and usually to rear its young. The term may also be used for structures or places used by animals who do not lay eggs, but use nests to shelter newborn young.