I did the boiling water thing on an anthill a few days ago. After things cooled down I checked and noticed the survivors removing dead ant bodies from the nest. OK, I can see them wanting to clean house a bit after that, right?
Then the next morning I went out and noticed all these black specks on a white office chair mat (repurposed to prevent weeds) about three feet or so from the hill. The survivors had set the bodies on this mat! Was this their graveyard?? Watching closely I saw ants picking up bodies, carry them around on the mat, then set them down again only pick up another body and repeat. I must have sat watching this for 10 or 15 minutes, it was weird! They were moving the bodies around on the mat!
The next day all of the bodies were gone! Maybe birds ate them or maybe the ants moved them again.