Herd (noun)

1. A large group of animals of one kind that live together and are usually domesticated.
2. A large number of people or things moving or gathered together.
3. A group of people who share a common interest or purpose.

Origin:

Old english heord, of germanic origin; related to dutch herd and german herde.

Examples:

1. The farmer rounded up the herd of cows and took them to the market.
2. A herd of elephants was crossing the road.
3. The tourists formed a herd as they walked through the crowded streets.
4. The herd mentality often leads to irrational decisions.
5. The protesters formed a herd in front of the city hall to protest the new laws.