A Calodexia fly sits by an army ant swarm (a), waiting for cockroaches and crickets. It lays its eggs on a cricket, which dies a day later with a maggot visible behind its head (b). Three days later, the cricket is mostly eaten with maggots jutting out of its corpse (c). Four days later still, and the maggots have pupated. Photos by Stefanie Berghoff.