Some primary papers on mechanisms and evolution of cooperative breeding in dwarf mongooses (Helogale parvula) in Serengeti National Park
Scott Creel

Creel & Creel 1991. Energetics, reproductive suppression and obligate communal breeding in carnivores. Behavioral Ecology and Sociobiology 28:263-270.
Creel et al. 1991.   Spontaneous lactation is an adaptive result of pseudopregnancy. Nature 351:660-662.
Creel & Waser 1991.  Failures of reproductive suppression in dwarf mongooses (Helogale parvula): accident or adaptation? Behavioral Ecology 2:7-15.
Creel et al 1992.  Behavioural and endocrine mechanisms of reproductive suppression in Serengeti darf mongooses.  Animal Behaviour 43: 231-245.
Creel & Waser 1994 Inclusive fitness and reproductive strategies in dwarf mongooses.  Behavioral Ecology 5:339-348.
Creel S  2001. Social dominance and stress hormones.  Trends in Ecology and Evolution 16: 491-497