in the canopies of trees or in the forest foliage. Wood ants seem to favour prey that lives in local canopies near their nest; however, when food resources dwindle, they seek other trees further from the nests and explore more trees instead of exploring the forest floor more thoroughly. This makes foraging for food significantly less efficient, but the rest of the nest does not help the foraging ants. Kin behaviour Wood ants have shown aggressive behaviour toward their own species in certain situations. Intraspecific competition usually occurs early in the spring between workers of competing nests. This aggression may be linked to the protection of maintaining territory and trail. By observing skirmishes and trail formation of wood ants, the territory surrounding each nest differs between seasons. Permanent foraging trails are reinforced each season, and if an ant from an alien species crossed it, hostile activity occurs. Most likely, the territory changes based on foraging patterns are influenced by seasonal changes. Ants recognize their nestmates through chemical signals. Failure in recognition causes the colony integrity to decay. Heavy metals accumulated through the environment alter the aggression levels. This could be due to a variety of factors such as changes in physiological effect or changes in resource levels. The ants in these territories tend to be less productive and efficient. Increased resource competition would be expected to increase level of aggression, but this is not the case. Colony structure Different types of F. rufa group species have demonstrated different types of social interaction. Some groups are highly polygynous, with multiple queen colonies forming large networks of connected nests. Others are monogynous, with single-queen colonies. Different F. rufa ants from different regions have been recorded as having traits of being both polygynous and monogynous. The females in the F. rufa colonies that are monogynous separate by flight and establish new nests. Queens in polygynous nests form new nests in the vicinity of the original nest with the help of workers. Through evolution, polygyny may have arisen through monogyny. One possibility is that monogynous nests due to environmental and physiological conditions may take up new queens. Sometimes in monogynous nests, daughters are recruited as new reproductives and the nest becomes polygynous. Nest splitting Wood ants typically have multiple nests so they may relocate in case of drastic changes in the environment. This splitting of nests causes the creation of multiple daughter nests. Several