A bevy is a flock of birds. Although the term can be used for a variety of birds, it most often refers specifically to a bevy of quail. Other terms exist to describe flocks of other types of birds, for example, a murder of crows.
A bevy can also describe a large gathering of people, usually of the same type (a bevy of schoolchildren; a bevy of tourists). Most often, however, bevy is used to refer to a gathering of women. At a family reunion, you may find your grandmother holding court in the kitchen with a bevy of female relations. Young, attractive women are sometimes referred to, somewhat poetically, as "a bevy of beauties."