Flat parts of the earthen mound and the floor of the adjacent spaces were carpeted with bodies of dead ants. Locally the deposits were a few centimetres thick. (...) the number of dead Formica polyctena workers probably amounted to about two million. The cemeteries comprised also remnants of other insects, most probably those caught by foragers of the free-living upper colony that had fallen down. Of other ants, only a head of the Leptothorax sp. worker was found.

"Ah yes, that small speck of chitin among 2 million other corpses is obviously a head of the Leptothorax sp. worker."