flock 1 
(flŏk)
(flŏk)n.
1. A group of animals that live, travel, or feed together.
2. A group of people under the leadership of one person, especially the members of a church.
3. A large crowd or number: a flock of visitors; a flock of questions. See Synonyms at crowd1.
intr.v. flocked, flock·ing, flocks
To gather or travel in a flock or crowd.
[Middle English flok, from Old English floc.]