The mound of F. polyctena’s bunker ‘colony’ in close-up. In the background, against the wall, an ant ‘cemetery’ is visible. Photo taken on 24.07.2015 (Wojciech Stephan).

  Part of: Czechowski W, Rutkowski T, Stephan W, Vepsäläinen K (2016) Living beyond the limits of survival: wood ants trapped in a gigantic pitfall. Journal of Hymenoptera Research 51: 227-239.