čopor

1. (of animals) pack
   U šumi su videli čopor vukova. — They saw a pack of wolves in the forest.
   Čopor pasa lutalica šeta po naselju. — A pack of stray dogs roams the neighbourhood.
2. derog. (of people) crowd; horde
   Ispred suda ga je čekao čopor novinara. — A horde of reporters was waiting for him outside the court.

The word depends on the species: čopor vukova / pasa (wolves, dogs), krdo goveda / slonova (cattle, elephants), stado ovaca / koza (sheep, goats), jato ptica / riba (birds, fish).