Mark Moffett / Amazon Ant (Polyergus sp) group returning to their home nest at the conclusion of a slave raid, grey slave ant carries one of their pupa, near Lake Tahoe, California

Mark Moffett / Amazon Ant (Polyergus sp) female worker positioning mandibles to pierce the head of an ant from an alien nest, Sagehen Creek, California

Mark Moffett / Amazon Ant (Polyergus sp) group at the advancing end of a slave raid, Sagehen Creek, California