no_name22

I am running a hexxit (1.0.5) server through a hosting service (fadehost.com) and for some reason the server spawned literally hundreds of chocobos near our house and is lagging and crashing our server. I need a way to kill all of them easily. I have tried installing plugins that kill mobs through the plugin service offered by fadehost but none of them have worked. How can i kill or clear all of these chocobos without having to kill them one by one?? Thanks