it also changes the adaptive value of certain behaviors, like cooperatively raising young. It has been proposed that chimerism creates a system that makes it evolutionarily advantageous for an individual to cooperate to raise its siblings; this closely matches to the way marmoset social systems have been observed to function in the wild. References External links Animal Diversity Web: Callithrix kuhlii Wied's marmoset Mammals of Brazil Endemic fauna of Brazil Wied's marmoset Wied's marmoset