What is a flock of quail called?

The collective noun for a flock of quail is "covey." The terms "bevy" or "drift" may also be used to refer to a flock of quail.

Quail are small, social birds that need the protection that group travelling provides. Covies travel and roost together so that predators are easily spotted. At night, the covey roosts in a circular formation so that all the birds can see approaching danger. A mother quail feigns injury and limps away from the covey if danger is approaching her brood. Quail use a variety of signals to communicate with others in the covey when traveling.