1. Baker AJ, 1991. Evolution of the social system of the golden lion tamarin (Leontopithecus rosalia): mating system, group dynamics, and cooperative breeding (PhD dissertation). College Park: University of Maryland.
2. Blaffer-Hrdy S, 1999. Mother nature. New York: Ballantine Books.
3. Boran JR, Heimlich SL, 1999. Social learning in cetaceans: hunting, hearing and hierarchies. In: Mammalian social learning: comparative and ecological perspectives (Box HO, Gibson KR, eds). Cambridge: Cambridge University Press; 282–307.
4. Brotherton PNM, Clutton-Brock TH, O'Riain MJ, Gaynor D, Sharpe L, Kansky R, McIlrath GM, 2001. Offspring food allocation by parents and helpers in a cooperative mammal. Behav Ecol12:590–599.
5. Brown GR, Almond REA, Bates NJ, 2005. Adult-infant food transfer in common marmosets: an experimental study. Am J Primatol65:301–312.