Source : Webster's Revised Unabridged Dictionary (1913)

Herd \Herd\, v. i. [imp. & p. p. {Herded}; p. pr. & vb. n.
   {Herding}.] [See 2d {Herd}.]
   1. To unite or associate in a herd; to feed or run together,
      or in company; as, sheep herd on many hills.

   2. To associate; to ally one's self with, or place one's self
      among, a group or company.

            I'll herd among his friends, and seem One of the
            number.                               --Addison.

   3. To act as a herdsman or a shepherd. [Scot.]

Source : WordNet®

herding
     adj : (of birds and animals) tending to move or live together in
           groups or colonies of the same kind; "ants are social
           insects"; "the herding instinct in sheep or cattle";
           "swarming behavior in bees" [syn: {herding(a)}, {swarming(a)},
            {social}]