Like many species in the Camponotus genus, C. festinatus engages in a mutualistic relationship with Blochmannia bacteria. The bacteria find a protected environment within the gut of the ant, while the ant receives added nutrition in its diet and may be able to mount a more effective immune response due to the presence of the bacteria [De Souza, 2006: 67-125]. C. festinatus maintains a facultative mutualistic relationship with Acacia Willardiana. [Chamberlain & Holland, 2009: 198]. Some colonies have been found sharing nesting sites with colonies of Crematogaster cerasi and Solenopsis amblychila, though the reasons behind this relationship are not known. [Mackay,W. & Mackay, E. 2002:290].