Pizza boxes contaminated with grease, electronics that aren't processed at standard recycling facilities, even the likes of Christmas lights, animal carcasses, and bowling balls.
And they had to cooperate to do so because their weapons were rather primitive and they did not want alpha males to be dominating the carcass after it was killed.
You had better remember how an attacking animal moves and what path was most efficient to escape so you can prevent yourself from becoming a carcass next time.
And we need the foot of a pig, the ribs of a pig, the carcass of a chicken, and a number of aromats (aromatics), including onion, leek, garlic, ginger, and shitake mushrooms.
After the beetles are finished with the carcass that we threw in there, we'll wash them a couple of times and then the bones are ready for the collection.