Birds of a feather flock together. [ Proverb ]

One dog can drive a flock of sheep. [ Proverb ]

Birds of prey do not flock together. [ Portuguese Proverb ]

If he had twenty in a flock,
He would leave but one to go with the cock. [ Proverb ]

His folded flock secure, the shepherd home
Hies merry-hearted; and by turns relieves
The ruddy milk-maid of her brimming pail;
The beauty whom perhaps his witless heart.
Unknowing what the joy-mixed anguish means,
Sincerely loves, by that best language shown
Of cordial glances, and obliging deeds. [ Thomson ]

There is no flock, however watched and tended.
But one dead lamb is there!
There is no fireside, howsoever defended,
But has one vacant chair. [ Longfellow ]

It is a sorry flock where the ewe bears the bell. [ Proverb ]

One scabby sheep is enough to infect a whole flock. [ Proverb ]

Man is an imitative being, and the foremost leads the flock. [ Friedrich Schiller ]

If all fools wore white caps we should seem a flock of geese. [ English Proverb, collected by George Herbert ]

All things atrocious and shameless flock from all parts to Rome. [ Tac ]

The entire flock in the fields dies of the disease introduced by one. [ Juv ]

When we read that the lost sheep is preferred to the rest of the flock, we are tempted to think that penitence is preferable to innocence.

That is, in a great degree, true of all men, which was said of the Athenians, that they were like sheep, of which a flock is more easily driven than a single one. [ Whately ]