When I first arrived, this large M. pergandei
nest was relatively quiet, with just a few workers
active. That all changed dramatically however, when the direct rays of the morning sun hit the nest at about 7:45AM. At this point, with an air temperature of 18°C / 64°F, hundreds off eager foragers poured out of the nest entrance in a single, wide column. This image shows the differently-sized workers that are are produced by the colony as availability of resources fluctuates during the year.
·Rissing, S.W. 1986. Annual Cycles in Worker Size of the Seed Harvesting Ant Veromessor pergandei (Hymenoptera: Formicidae). Behavioral Ecology and Sociobiology (1987) 20:117-124