The ants have been very busy disassembling these dead beetles and carrying them back to their nests. To give an idea of scale, the ants are about 7mm long. If you look at the spotty shells, which are the beetle wing cases, that's the equivalent of a human dismantling a car, then carrying the bonnet about 2km down the road and then trying to fit it into a hole just wider than 2 or 3 humans. The shells always lie around in quantity around the ant nest opening, making it look like a spare parts yard. I also wonder where it is that they found so many of the same kind of dead beetle in the first place.
Do they slowly chew the exoskeletons into smaller pieces that fit down the hole? They seem to me to just leave them piled up there.
Anyone who knows the answer to this is welcome to comment