- a breeding place or colony of gregarious birds or animals, as penguins and seals.
- a colony of rooks.
- a place where rooks congregate to breed.
- a crowded tenement house.
- a group of nesting rooks
- a clump of trees containing rooks' nests
- a breeding ground or communal living area of certain other species of gregarious birds or mammals, esp penguins or seals
- a colony of any such creatures
- an overcrowded slum tenement building or area of housing
