flock [flocks](group of animals, especially sheep or goats) noun [UK: flɒk] [US: ˈflɑːk]I saw a flock of sheep. = Vi un rebaño de ovejas.
herd [herds](a number of domestic animals assembled together under the watch or ownership of a keeper) noun [UK: hɜːd] [US: ˈhɝːd]Cows are herd animals. = Las vacas son animales de rebaño.
mob [mobs](group of animals) noun [UK: mɒb] [US: ˈmɑːb]