Imagine how awesome it would be if the mobs in siege of orgrimmar were part orcs part animals from durotar and the barrens? let me give some examples:
Porcs - these pig orcs are the most basic of the animal orcs. they fight like warriors, charging and yelling a lot;
Scorcs - these scorpid orcs are fast and dangerous. they fight like rogues, with speed and sharp poisonous tails;
Vultorcs - these vulture orcs fly in the sky. the raid must avoid the stuff they throw while ranged dps attack them;
Kodorcs - these kodo orcs are heavy elite units. they are essentially like porcs but much stronger, with much more HP and they don't yell;
Liorcs - these lion orcs are among the best of the animal orcs. they fight like a mix of porc and scorc (with no poison), charging, roaring, slashing and hacking with extreme fury;
General Wyvern - the leader of the animal orcs and the strongest among them. he fights like a liorc, but he has the poison attacks from the scorcs and he can fly like a vultorc. he's a badass boss
I might be slightly drunk